FN ISI Export Format VR 1.0 PT Journal AU Cartier, M Auffret, S Samson, Y Bayle-Guillemaud, P Dieny, B TI Magnetic domain configurations in exchange-coupled NiO/Co bilayer films SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS NR 18 AB The magnetic domain configurations of exchange-coupled NiO/Co bilayers were investigated by magnetic force microscopy. These bilayers exhibit a well-defined uniaxial anisotropy resulting from the deposition at oblique incidence of the NiO layer. Two types of magnetic contrast are identified: (i) bipolar contrast due to 180 degrees Neel walls in the parts of the walls which are parallel to the easy axis of magnetization, and (ii) monopolar contrast in the parts of the walls separating domains with meeting head-on magnetizations. These latter domain walls have a zigzag shape which represents a compromise between a decrease in the local density of magnetostatic energy and an increase in the wall length. The effect of the Co thickness of the shape on the domains is also discussed. (C) 2001 Elsevier Science B.V. All rights reserved. CR AITLAMINE H, 1992, J APPL PHYS, V71, P353 BOZORTH RM, 1951, FERROMAGETISM, P322 CARTIER M, IN PRESS CHO HS, 1999, J APPL PHYS 2A, V85, P5160 CHRISTIE L, 1999, THESIS U GLASGOW COWACHE C, 1998, IEEE T MAGN 1, V34, P843 DIENY B, 1999, IN PRESS 44 MMM C SA DIENY B, 1994, J MAGN MAGN MATER, V136, P335 HUBERT A, 1979, IEEE T MAGN, V15, P1251 HUBERT A, 1998, MAGNETIC DOMAINS HUBERT A, 1970, PHYS STATUS SOLIDI, V38, P699 LABRUNE M, 1984, J MAGN MAGN MATER, V44, P195 MAURI D, 1987, J APPL PHYS, V62, P3047 MEIKLEJOHN WH, 1956, PHYS REV, V102, P1413 NIKITENKO VI, 1998, J APPL PHYS 2, V83, P6828 NOGUES J, 1999, J MAGN MAGN MATER, V192, P203 RAMMUTHU KTM, 1993, IEEE T MAGN, V29, P2593 ZHU JG, 1997, J APPL PHYS 2A, V81, P4336 TC 0 BP 63 EP 72 PG 10 JI J. Magn. Magn. Mater. PY 2001 PD JAN VL 223 IS 1 GA 391UQ J9 J MAGN MAGN MATER UT ISI:000166374600009 ER PT Journal AU Franco-Puntes, V Batlle, X Labarta, A TI Domain structures and training effects in granular thin films SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS NR 24 AB Magnetic force microscopy (MFM) evidenced that sputtered CoFe- Ag(Cu) granular films displayed long-range magnetic domain structures (magnetic percolation) at ferromagnetic (FM) volume contents, x(nu), well below the volume percolation threshold. A variety of remanent magnetic microstructures was observed as a function of the thermomagnetic history, which strongly condition both magnetic and transport properties. These microstructures are formed due to the competition between perpendicular anisotropy and dipolar and matrix-mediated exchange interactions. All as-deposited samples displayed a high degree of [111] texture perpendicular to the film plane and a rhombohedral distortion induced by film-substrate strains, which are suggested to be at the origin of the observed perpendicular uniaxial anisotropy. Structural data indicate a 2% of CoFe is alloyed to the metallic matrix, which seems to be enough to couple the FM particles when they are closer than 1.5 nm at x(nu) greater than or equal to 25, leading to magnetic percolation. These FM correlations among particles were well evidenced in the low-field susceptibility measurements, which supports the hypothesis that exchange correlations propagate due to the CoFe spins diluted in the matrix. Annealing relaxed the rhombohedral distortion, leading to a cubic anisotropy along the [100] axis of the CoFe cell. Besides, annealing caused the segregation of the CoFe spins alloyed to the matrix, and consequently, the domain structure was lost. (C) 2000 Elsevier Science B.V. All rights reserved. CR ABELES B, 1976, APPL SOLID STATE SCI BAIBICH MN, 1988, PHYS REV LETT, V61, P2472 BATLLE X, 1997, APPL PHYS LETT, V70, P132 BERKOWITZ AE, 1992, PHYS REV LETT, V68, P3745 CHIKAZUMI S, 1964, PHYSICS MAGNETISM DIENY B, 1994, J MAGN MAGN MATER, V130, P197 FRANCO V, 1999, ACTA MATER, V47, P1661 FRANCO V, 1998, IEEE T MAGN 1, V34, P912 FRANCO V, IN PRESS EUROPEAN PH FRANCO V, IN PRESS J APPL PHYS FRANCO V, 1999, J APPL PHYS, V85, P7328 FRANCO V, 1999, J MAGN MAGN MATER, V196, P465 FRANCO V, UNPUB J PHYS D GREGG JF, 1996, PHYS REV LETT, V77, P1580 IGLESIAS O, 1999, J MAGN MAGN MATER, V196, P819 KELLY PE, 1989, IEEE T MAGN, V25, P3881 LABARTA A, 1993, PHYS REV B, V48, P10240 MCGUIRE TR, 1975, IEEE T MAGN, V4, P95193 MENDES JA, 1997, J APPL PHYS 2B, V81, P5208 MORRAL FR, 1958, COBALT ITS ALLOYS OUNADJELA K, 1996, PHYS REV B, V54, P12252 STAMPS RL, 1997, J APPL PHYS 2B, V81, P4751 XIAO JQ, 1997, J APPL PHYS, V79, P5309 XIAO JQ, 1992, PHYS REV LETT, V68, P3749 TC 0 BP 45 EP 56 PG 12 JI J. Magn. Magn. Mater. PY 2000 PD NOV VL 221 IS 1-2 GA 369XK J9 J MAGN MAGN MATER UT ISI:000165092900007 ER PT Journal AU Sarkozi, Z Mackay, K Peuzin, JC TI Elastic properties of magnetostrictive thin films using bending and torsion resonances of a bimorph SO JOURNAL OF APPLIED PHYSICS NR 23 AB The modification of the elastic properties of giant magnetostriction alloy films due to an applied magnetic field (the DeltaE effect), has been studied. Two different types of films were deposited on Si substrates: (i) single layers of TbDyFeCo alloys typically 1000 nm thick and (ii) nanocomposite multilayer films of FeCo/TbFeCo each having a typical thickness of 6 nm. Both types of films were rendered magnetically anisotropic with a well defined in-plane easy axis. Rectangular samples were cut out of these bimorphs and firmly glued at one end to a heavy base to form a simple cantilever structure. The variations of film elastic moduli were deduced from the shifts of the cantilever resonance frequencies as a function of bias field for two basic configurations: (i) field applied along the easy axis and (ii) field applied along the hard axis. In contrast with previous work, both flexural and torsion resonance modes were excited and studied. As a result the field induced variations of both planar traction modulus and the shear modulus were obtained and new interesting features were discovered. In particular strongly negative values of the shear modulus were observed (at least in the nanocomposite films) in the vicinity of the divergence in the transverse magnetic susceptibility at saturation field along the hard axis. A simple but complete theoretical analysis shows that the uniaxial anisotropy model together with the assumption of isotropic magnetoelastic coupling gives a good semiquantitative understanding of all the experimental results. (C) 2000 American Institute of Physics. [S0021-8979(00)09322-1]. CR ATALAY S, 1993, J APPL PHYS, V73, P871 ATKIN JD, 1996, J IMMUNOL, V157, P156 BECKER R, 1934, Z PHYS, V88, P634 DEGAUQUE J, 1980, PHYS STATUS SOLIDI A, V59, P805 DELACHEISSERIE ED, MAGNETOSTRICTION DELACHEISSERIE EDT, 1994, J MAGN MAGN MATER, V136, P189 FELDTKELLER E, 1963, Z PHYS, V176, P510 GIVORD D, 1996, P 2 INT WORKSH MAT S, P287 GUTIERREZ J, 1996, J MAGN MAGN MATER, V157, P543 HOFFMANN H, 1969, PHYS STATUS SOLIDI, V33, P175 KLOKHOLM E, 1976, IEEE TRANS MAGN, V12, P819 LIVINGSTON JD, 1982, PHYS STATUS SOLIDI A, V70, P591 PERRIN G, 1996, J MAGN MAGN MATER, V157, P289 QUANDT E, 1996, 196211662, DE SMITH GW, 1969, J APPL PHYS, V40, P5174 SPANO ML, 1982, J APPL PHYS, V53, P2667 SQUIRE PT, 1995, IEEE T MAGN, V31, P1239 SQUIRE PT, 1995, J MAGN MAGN MATER, V140, P1829 SQUIRE PT, 1990, J MAGN MAGN MATER, V87, P299 SU Q, 1996, J APPL PHYS, V80, P3604 TAM AC, 1989, IEEE T MAGN, V25, P2629 THOMPSON DA, 1975, IEEE T MAGN, V11, P1039 WATTS R, 1997, APPL PHYS LETT, V70, P2607 TC 0 BP 5827 EP 5832 PG 6 JI J. Appl. Phys. PY 2000 PD NOV 15 VL 88 IS 10 GA 369MA J9 J APPL PHYS UT ISI:000165068700050 ER PT Journal AU Klumper, A Zvyagin, AA TI Disordered magnetic impurities in uniaxial critical quantum spin chains SO JOURNAL OF PHYSICS-CONDENSED MATTER NR 44 AB We calculate exactly the thermodynamics of ensembles of magnetic impurities with randomly distributed host-impurity couplings in the critical region of the uniaxial spin-1/2 quantum chain. We derive a finite set of integral equations describing the complete temperature and magnetic field dependence of the system. Exact numerical results for arbitrary values of temperature and external magnetic field are obtained. We show that for strong disorder the quenching of the impurity moments is absent. For weak disorder the screening persists, but with a critical non-Fermi-liquid behaviour of the magnetic susceptibility and specific hear. We point out that the 'easy- plane' magnetic anisotropy does not qualitatively change the behaviour of the thermodynamic characteristics of the disordered impurities in the antiferromagnetic chain. On the other hand, anisotropy of ferromagnetic type can enhance the tendency to quenching of the impurities for strong disorder. CR AFFLECK I, 1995, ACTA PHYS POL B, V26, P1869 ALTSHULER BL, 1987, JETP LETT, V45, P687 ANDRAKA B, 1994, PHYS REV B, V49, P348 ANDRAKA B, 1994, PHYS REV B, V49, P3589 ANDREI N, 1984, PHYS LETT A, V100, P108 ANDREI N, 1983, REV MOD PHYS, V55, P331 ARONSON MC, 1995, PHYS REV LETT, V75, P725 BERNAL OO, 1995, PHYS REV LETT, V75, P2023 BHATT RN, 1992, PHYS REV LETT, V68, P3072 BOOTH CH, 1998, PHYS REV LETT, V81, P3960 BULAEVSKII LN, 1972, ZH EKSP TEOR FIZ, V35, P384 DASGUPTA C, 1980, PHYS REV B, V22, P1305 DEANDRADE MC, 1998, PHYS REV LETT, V81, P5620 DOBROSAVLJEVIC V, 1992, PHYS REV LETT, V69, P1113 FRAHM H, 1997, J PHYS-CONDENS MAT, V9, P9939 HIRSCH JE, 1980, J PHYS C SOLID STATE, V13, PL53 HIRSCH JE, 1980, PHYS REV B, V22, P5355 IKEGAMI K, 1987, PHYS REV B, V35, P3667 KLUMPER A, 1992, ANN PHYS-LEIPZIG, V1, P540 KLUMPER A, 1998, EUR PHYS J B, V5, P677 KLUMPER A, 1998, PHYS REV LETT, V81, P4975 KLUMPER A, 1993, Z PHYS B CON MAT, V91, P507 KONDO J, 1969, SOLID STATE PHYS, V23, P184 KOREPIN VE, 1993, QUANTUM INVERSE SCAT LOHNEYSEN HV, 1997, PHYSICA B, V230, P550 MA SK, 1979, PHYS REV LETT, V43, P1434 MACLAUGHLIN DE, 1998, PHYS REV B, V58, P11849 MAPLE MB, 1995, J LOW TEMP PHYS, V99, P223 MATSUHIRA K, 1995, PHYSICA B, V206, P326 MIRANDA E, 1996, J PHYS-CONDENS MAT, V8, P9871 MIRANDA E, 1997, PHYS REV LETT, V78, P290 NETO AHC, 1998, PHYS REV LETT, V81, P3531 RAJAN VT, 1983, PHYS REV LETT, V51, P308 SCHLOTTMANN P, 1993, ADV PHYS, V42, P641 SCHLOTTMANN P, 1997, PHYS REV B, V56, P13989 SCHLOTTMANN P, 1994, PHYS REV B, V49, P9202 SEAMAN CL, 1991, PHYS REV LETT, V67, P2882 SHLYK L, 1999, J PHYS-CONDENS MAT, V11, P3525 SUZUKI M, 1987, PROG THEOR PHYS, V78, P787 TSVELICK AM, 1983, ADV PHYS, V32, P453 ZVYAGIN AA, 1997, J PHYS-CONDENS MAT, V9, P3543 ZVYAGIN AA, 1997, J PHYS-CONDENS MAT, V9, P6479 ZVYAGIN AA, 1995, PHYS REV B, V52, P6569 ZVYAGIN AA, 1997, PHYS REV LETT, V79, P4641 TC 0 BP 8705 EP 8726 PG 22 JI J. Phys.-Condes. Matter PY 2000 PD OCT 9 VL 12 IS 40 GA 367YL J9 J PHYS-CONDENS MATTER UT ISI:000090090000016 ER PT Journal AU Park, BS Kim, CG Kim, DY Song, JS Min, BK TI Estimate of crystalline anisotropy by using the asymmetric AMR curve in NiO/NiFe bilayer SO JOURNAL OF THE KOREAN PHYSICAL SOCIETY NR 10 AB Anisotropic magnetoresistance(AMR) curves were measured as functions of the angle between the applied and the exchange coupling fields in bilayer NiO/NiFe(x)(x=50, 100, 200, and 300 A), and the data were compared with the results from calculations using the single-domain model with uniaxial crystalline anisotropy. The AMR was asymmetric for an applied field less than the? exchange coupling field. The maximum MR in the asymmetric AMR was observed at a negative angle(clockwise rotation) from the exchange coupling field in the 50 and 100 A samples, but at a positive angle in the 300 A sample. Such a variation of the AMR can be explained well Ly a change ill the value of the uniaxial anisotropy field from positive to negative as the NiFe thickness increases, as well as bq its angle from the exchange coupling field. This suggests that the characteristics of crystalline anisotropy originating from the fabrication call be estimated from AMR measurements. CR BOLLS R, 1989, SENSORS, V5, PCH9 CAREY MJ, 1992, APPL PHYS LETT, V60, P3060 DIENY B, 1994, J MAGN MAGN MATER, V136, P335 KIM CG, 1999, J MAGN MAGN MATER, V198, P33 KIM DY, 1999, J APPL PHYS 2B, V85, P5783 LEE SS, 1997, J APPL PHYS 2B, V81, P5298 LIN T, 1995, IEEE T MAGN, V31, P2585 QUIN Z, 1998, J APPL PHYS, V83, P6825 SOEYA S, 1996, J APPL PHYS, V79, P1604 SONG O, 1994, APPL PHYS LETT, V64, P2593 TC 0 BP 434 EP 437 PG 4 JI J. Korean Phys. Soc. PY 2000 PD OCT VL 37 IS 4 GA 363WB J9 J KOREAN PHYS SOC UT ISI:000089859700014 ER PT Journal AU Ercole, A Lew, WS Lauhoff, G Kernohan, ETM Lee, J Bland, JAC TI Temperature-dependent spin-wave behavior in Co/CoO bilayers studied by Brillouin light scattering SO PHYSICAL REVIEW B NR 47 AB We report Brillouin light scattering measurements of spin-wave frequencies in exchange coupled ferromagnet (FM)/antiferromagnet (AF) epitaxial Co/CoO bilayer structures. The ultrathin (7 Angstrom) CoO layer perturbs the Co layer spin-wave frequencies and so permits a study of the influence of the AF CoO layer at the interface, when the unidirectional anisotropy is negligible. A striking temperature dependence of the measured frequencies in the cobalt layer in the range 77 to 300 K was observed which has been demonstrated to be due to exchange coupling to the CoO layer as antiferromagnetic order develops. Furthermore, the existence of a uniaxial anisotropy field in the range 100-300 Oe within the AF layer along the FM layer magnetization direction was demonstrated. The ratio of the interface to the bulk AF exchange coupling strengths was found to lie in the range 0.75 to 1.1. The observed temperature dependence of the spin-wave linewidths indicate that locally ordered AF regions persist above the Neel temperature and play a central role in determining the magnetic behavior. CR AMBROSE T, 1997, PHYS REV B, V56, P83 AMBROSE T, 1996, PHYS REV LETT, V76, P1743 BLAND JAC, 1994, ULTRATHIN MAGNETIC S BORCHERS JA, 1999, J APPL PHYS 2B, V85, P5883 CAMLEY RE, 1999, J MAGN MAGN MATER, V198, P402 CHIKAZUMI S, 1997, PHYSICS FERROMAGNETI CHOU HH, 1976, PHYS REV B, V13, P3924 COTTAM MG, 1989, INTRO SURFACE SUPERL DAMON RW, 1961, J PHYS CHEM SOLIDS, V19, P308 DEMCZYK BG, 1996, J APPL PHYS, V80, P5035 DIENY B, 1991, PHYS REV B, V43, P1297 ERCOLE A, 1996, J MAGN MAGN MATER, V156, P121 GRIGORIEV IS, 1997, HDB PHYSICAL QUANTIT HAN DH, 1997, J APPL PHYS 2B, V81, P4996 HAYES RR, 1974, SOLID STATE COMMUN, V14, P173 HECKMANN O, 1994, SURF SCI, V312, P62 HEINRICH B, 1993, ADV PHYS, V42, P523 HICKEN RJ, 1995, J MAGN MAGN MATER, V145, P278 HILLEBRANDS B, 1999, REV SCI INSTRUM, V70, P1589 HUTCHINGS MT, 1970, J PHYS C, V3, P307 IJIRI Y, 1998, PHYS REV LETT, V80, P608 JOHNSON FM, 1959, PHYS REV, V114, P705 KAMBERSKY V, 1976, CZECH J PHYS B, V26, P1366 KOON NC, 1997, PHYS REV LETT, V78, P4865 KRAMS P, 1992, PHYS REV LETT, V69, P3674 LEE J, 1997, PHYS REV B, V55, P15103 MALOZEMOFF AP, 1988, J APPL PHYS, V63, P3874 MATHIEU C, 1998, J APPL PHYS, V83, P2863 MCMICHAEL RD, 1998, PHYS REV B, V58, P8605 MEIKLEJOHN WH, 1957, PHYS REV, V105, P904 MEIKLEJOHN WH, 1956, PHYS REV, V102, P1413 MICHEL RP, 1998, PHYS REV B, V58, P8566 MILTENYI P, 1999, PHYS REV B, V59, P3333 MOCK R, 1987, J PHYS E SCI INSTRUM, V20, P656 MORAN TJ, 1995, J APPL PHYS, V78, P1887 NAIK R, 1993, PHYS REV B, V48, P1008 NEVOT L, 1980, REV PHYS APPL, V15, P761 PARKIN SSP, 1999, J APPL PHYS 2B, V85, P5828 PATTON CE, 1984, PHYS REP, V103, P251 PENFOLD J, 1991, PHYSICA B, V173, P1 SCHULTHESS TC, 1999, J APPL PHYS 2B, V85, P5510 SCOTT JC, 1985, J APPL PHYS, V57, P3681 SMARDZ L, 1992, J APPL PHYS, V71, P5199 STAMPS RL, 1997, J APPL PHYS 2A, V81, P4485 STAMPS RL, 1996, PHYS REV B, V54, P4159 STROM V, 1997, J APPL PHYS 2B, V81, P5003 SUHL H, 1998, PHYS REV B, V58, P258 TC 1 BP 6429 EP 6436 PG 8 JI Phys. Rev. B PY 2000 PD SEP 1 VL 62 IS 10 GA 353ZB J9 PHYS REV B UT ISI:000089304400048 ER PT Journal AU Layadi, A TI A method for the determination of exchange and magnetocrystalline anisotropies in exchange-coupled thin films SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS NR 16 AB A method for the determination of exchange and magnetocrystalline anisotropies in exchange-coupled bilayer thin films is presented. The interfacial exchange anisotropy is modeled as a magnetic field H-E. The ferromagnetic film is taken to be a single crystal with cubic and uniaxial magnetocrystalline anisotropies. The method is based on the torque curve slope. It will be shown how the study of the torque curve slope can lead to the values of the exchange anisotropy field H-E, the magnetization M and the cubic or the uniaxial anisotropy fields. (C) 2000 Elsevier Science B.V. All rights reserved. CR ARTMAN JO, 1985, IEEE T MAGN, V21, P1271 CAIN WC, 1988, IEEE T MAGN, V24, P2609 HAN DH, 1997, J APPL PHYS, V81, P340 LAYADI A, 1987, IEEE T MAGN, V23, P2993 LAYADI A, 1999, J MAGN MAGN MATER, V192, P353 LAYADI A, 2000, UNPUB J APPL PHYS LIN X, 1994, J APPL PHYS, V76, P6545 MALOZEMOFF AP, 1988, J APPL PHYS, V63, P3874 MATHIEU C, 1998, J APPL PHYS, V83, P2863 MEIKLEJOHN WH, 1957, PHYS REV, V105, P904 MEIKLEJOHN WH, 1956, PHYS REV, V102, P1413 REDON O, 1998, J APPL PHYS, V83, P2851 SCOTT JC, 1985, J APPL PHYS, V57, P3681 SOEYA S, 1995, J APPL PHYS, V77, P5838 SPERIOSU VS, 1987, IEEE T MAGN, V23, P2999 TONEY MF, 1991, J APPL PHYS, V70, P6227 TC 0 BP 294 EP 302 PG 9 JI J. Magn. Magn. Mater. PY 2000 PD SEP VL 219 IS 3 GA 355BL J9 J MAGN MAGN MATER UT ISI:000089365700007 ER PT Journal AU Dafalias, YF TI Orientational evolution of plastic orthotropy in sheet metals SO JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS NR 46 AB Recent experimental findings show that when orthotropic sheet metal samples are subjected to uniaxial tensile loading at an angle to the orthotropic axes, a drastic re-orientation of the axes takes place at moderate tensile strain levels, while orthotropic symmetries are preserved. This phenomenon is explained and simulated within a simple theory of plasticity, which combines Hill's quadratic yield criterion for orthotropy with the concept of plastic spin as a necessary constitutive ingredient for the orientational evolution of anisotropic tensorial internal variables. Detailed analytical investigation, corroborated by the experimental data, shows a trend of anisotropic axes rotation towards alignment of a pertinent minimum yield stress with the stretching direction. This-imposes a constitutive coupling relation between the anisotropic parameters and the plastic spin coefficient. Similarities and differences with other works as well as unresolved questions are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved. CR ARMINJAN M, 1993, MECAMA7 91, P89 ARMINJON M, 1991, ACTA MECH, V88, P219 BESSELING JF, 1994, MATH MODELLING INELA BISHOP JFW, 1951, PHILOS MAG, V42, P414 BOEHLER JP, 1979, Z ANGEW MATH MECH, V59, P157 BUNGE HJ, 1997, INT J PLASTICITY, V13, P435 CHO HW, 1996, INT J PLASTICITY, V12, P903 DAFALIAS YF, 1993, ACTA MECH, V100, P171 DAFALIAS YF, 1989, ADV PLASTICITY 1989, P287 DAFALIAS YF, 1984, ASME SPECIAL PUBLICA, P25 DAFALIAS YF, 1998, CONSTITUTIVE DAMAGE, P791 DAFALIAS YF, 1987, CONSTITUTIVE LAWS EN, V1, P69 DAFALIAS YF, 1998, INT J PLASTICITY, V14, P909 DAFALIAS YF, 1989, INT J PLASTICITY, V5, P227 DAFALIAS YF, 1985, J APPL MECH-T ASME, V52, P865 DAFALIAS YF, 1983, J APPL MECH-T ASME, V50, P561 DAFALIAS YF, 1993, J ENG MECH-ASCE, V119, P1260 DAFALIAS YF, 1984, MECH MATER, V3, P223 DAFALIAS YF, 1983, P CNRS INT C, V351 DAFALIAS YF, 1979, Z ANGEW MATH MECH, V59, P437 HILL R, 1992, ASME J APPL MECH, V59, P51 HILL R, 1979, MATH P CAMB PHIL SOC, V85, P179 HILL R, 1950, MATH THEORY PLASTICI KIM KH, 1997, J MECH PHYS SOLIDS, V45, P841 KURODA M, 1999, COMMUNICATION KURODA M, 1997, INT J PLASTICITY, V13, P359 LEE EH, 1983, J APPL MECH-T ASME, V50, P554 LEE H, 1995, INT J PLASTICITY, V11, P423 LEVITAS VI, 1998, J MECH PHYS SOLIDS, V46, P557 LIU IS, 1982, INT J ENG SCI, V20, P1099 LORET B, 1992, J MECH PHYS SOLIDS, V40, P417 LORET B, 1983, MECH MATER, V2, P287 MAJORS P, 1994, MECH RES COMMUN, V21, P465 MANDEL J, 1971, COURSES LECT PEREDA JJ, 1993, MECH MATER, V15, P3 PRANTIL VC, 1993, J MECH PHYS SOLIDS, V41, P1357 QIAN ZF, 1996, INT J SOLIDS STRUCT, V33, P4167 RASHID MM, 1992, J MECH PHYS SOLIDS, V40, P1009 SWIFT HW, 1947, ENGINEERING, V163, P253 TAYLOR GI, 1938, J I MET, V62, P307 TUGCU P, 1999, INT J PLASTICITY, V15, P1021 VANDERGIESSEN E, 1992, MECH MATER, V13, P93 ZBIB HM, 1993, ACTA MECH, V96, P119 ZBIB HM, 1991, ACTA MECH, V87, P179 ZBIB HM, 1988, ACTA MECH, V75, P15 ZHANG Y, 1993, J MECH PHYS SOLIDS, V41, P1213 TC 0 BP 2231 EP 2255 PG 25 JI J. Mech. Phys. Solids PY 2000 PD NOV VL 48 IS 11 GA 352YE J9 J MECH PHYS SOLIDS UT ISI:000089246300001 ER PT Journal AU Jiang, JS Felcher, GP Inomata, A Goyette, R Nelson, CS Bader, SD TI Exchange bias in Fe/Cr double superlattices SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS NR 27 AB Utilizing the oscillatory interlayer exchange coupling in Fe/Cr superlattices, we have constructed "double superlattice" structures where a ferromagnetic (F) and an antiferromagnetic (BF) Fe/Cr superlattice are coupled through a Cr spacer. The minor hysteresis loops in the magnetization are shifted from zero field, i.e., the F superlattice is exchange biased by the AF one. The double superlattices are sputter deposited with (211) epitaxy and possess uniaxial in-plane magnetic anisotropy. The magnitude of the bias field is satisfactorily described by the classic formula for collinear spin structures. The coherent structure and insensitivity to atomic-scale roughness makes it possible to determine the spin distribution by polarized neutron reflectivity, which confirms that the spin structure is collinear. The magnetic reversal behavior of the double superlattices suggests that a realistic model of exchange bias needs to address the process of nucleating local reverse domains. (C) 2000 American Vacuum Society. [S0734- 2101(00)02204-1]. CR BRUNO P, 1995, PHYS REV B, V52, P411 CAMLEY RE, 1999, J VAC SCI TECHNOL 1, V17, P1335 DIENY B, 1991, PHYS REV B, V43, P1297 FELCHER GP, 1993, J MAGN MAGN MATER, V121, P105 FOLKERTS W, 1991, J MAGN MAGN MATER, V94, P302 FULLERTON EE, 1994, J APPL PHYS, V75, P6461 FULLERTON EE, 1993, PHYS REV B, V48, P15755 JUNGBLUT R, 1995, J MAGN MAGN MATER, V148, P300 KIWI M, 1999, EUROPHYS LETT, V48, P573 KOON NC, 1997, PHYS REV LETT, V78, P4865 MALOZEMOFF AP, 1987, PHYS REV B, V35, P3679 MAURI D, 1987, J APPL PHYS, V62, P3047 MEIKLEJOHN WH, 1962, J APPL PHYS, V33, P1328 MEIKLEJOHN WH, 1957, PHYS REV, V105, P904 NIKITENKO VI, 1998, PHYS REV B, V57, PR8111 NOGUES J, 1999, J MAGN MAGN MATER, V192, P203 PARKIN SSP, 1991, PHYS REV B, V44, P7131 PARKIN SSP, 1990, PHYS REV B, V42, P10583 PARKIN SSP, 1990, PHYS REV LETT, V64, P2304 SCHULTHESS TC, 1998, PHYS REV LETT, V81, P4516 STILES MD, 1999, PHYS REV B, V59, P3722 SUHL H, 1998, PHYS REV B, V58, P258 TAKANO K, 1997, PHYS REV LETT, V79, P1130 TANG C, 1984, J APPL PHYS, V55, P2226 TEVELTHUIS SGE, 1999, APPL PHYS LETT, V75, P4174 WANG RW, 1994, PHYS REV LETT, V72, P920 ZABEL H, 1994, PHYSICA B, V198, P156 TC 2 BP 1264 EP 1268 PG 5 JI J. Vac. Sci. Technol. A-Vac. Surf. Films PY 2000 PD JUL-AUG VL 18 IS 4 PN 1 GA 335ZH J9 J VAC SCI TECHNOL A UT ISI:000088276800044 ER PT Journal AU Inomata, A Jiang, JS You, CY Pearson, JE Bader, SD TI Magnetic stability of novel exchange coupled systems SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS NR 11 AB The magnetic stability of two different interfacial exchange coupled systems is investigated using the magneto-optic Kerr effect during repeated reversal of the soft layer magnetization by field cycling up to 10(7) times, For uniaxial Fe/Cr(211) exchange biased "double-superlattice" systems, small but rapid initial decay of exchange bias field HE and the remanent magnetization is observed. Also the Sm-Co/Fe bilayers grown epitaxially with uniaxial in-plane anisotropy show similar decay, However, the HE Of biaxial and random in-plane bilayers shows gradual decay without large reduction of the magnetization. These different decay behaviors are explained by their different microstructure and interfacial spin configurations. (C) 2000 American Vacuum Society. [S0734- 2101(00)02104-7]. CR BENAISSA M, 1998, IEEE T MAGN 1, V34, P1204 CHARAP SH, 1997, IEEE T MAGN 2, V33, P978 DIENY B, 1991, PHYS REV B, V43, P1297 FULLERTON EE, 1997, APPL PHYS LETT, V71, P1579 FULLERTON EE, 1998, PHYS REV B, V58, P12193 FULLERTON EE, 1993, PHYS REV B, V48, P15755 GIDER S, 1998, SCIENCE, V281, P797 KNELLER EF, 1991, IEEE T MAGN, V27, P3588 NIKITENKO VI, 1998, PHYS REV B, V57, PR8111 NOGUES J, 1999, J MAGN MAGN MATER, V192, P203 PACCARD D, 1966, PHYS STATUS SOLIDI, V16, P301 TC 0 BP 1269 EP 1272 PG 4 JI J. Vac. Sci. Technol. A-Vac. Surf. Films PY 2000 PD JUL-AUG VL 18 IS 4 PN 1 GA 335ZH J9 J VAC SCI TECHNOL A UT ISI:000088276800045 ER PT Journal AU Tryland, T Hopperstad, OS Langseth, M TI Design of experiments to identify material properties SO MATERIALS & DESIGN NR 9 AB Uniaxial tensile tests were carried out to obtain the variation of the material properties from one aluminium extrusion to another as well as over the cross-section and along the extrusion. Tests were performed in tension and compression to evaluate the effect of loading, and the anisotropy was determined through uniaxial tensile tests in three different directions: 0 degrees, i.e. the extrusion direction, 45 degrees and 90 degrees. The difference in strength between the three aluminium alloy AA6082-T6 extrusions was approximately 12%. Furthermore, the strength depends strongly on the orientation of the specimen relative to the extrusion axis. Highest strength was observed for the 90 degrees direction while the 45 degrees direction has least strength. The compressive strength was significantly higher than the tensile strength, while the variation of the strength over the cross-sections and along the extrusions was not prominent. Several experimental designs were investigated, and comparison of the results by analysis of variance and hypothesis testing was used to identify the best experimental design. (C) 2000 Elsevier Science Ltd. All rights reserved. CR BOX GEP, 1978, STAT EXPT INTRO DESI HATCH JE, 1984, ALUMINUM PROPERTIES HOPPERSTAD OS, 1999, J THIN WALLED STRUCT, V34, P279 HOSFORD WF, 1993, METAL FORMING MECH M LADEMO OG, 1997, R397 NORW U SCI TECH MAZZOLANI FM, 1996, 5 INT C STRUCT STAB MAZZOLANI FM, 1995, ALUMINIUM ALLOY STRU MOEN LA, 1998, J STRUCT ENG-ASCE, V124, P712 OPHEIM BS, 1996, THESIS NORWEGIAN U S TC 1 BP 477 EP 492 PG 16 JI Mater. Des. PY 2000 PD OCT VL 21 IS 5 GA 321RT J9 MATER DESIGN UT ISI:000087469000007 ER PT Journal AU Tang, YJ Roos, BFP Mewes, T Bauer, M Demokritov, SO Hillebrands, B Zhan, WS TI Exchange bias effect and anisotropy analysis of FM/AF bilayers SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY NR 17 AB The exchange bias effect of NiFe-MnPd bilayers and a new system Fe-MnPd bilayers was analyzed. Through fitting the in-plane angular dependence of the exchange bias field H-ex and the coercivity H-c obtained by magneto-optical Kerr effect (MOKE), the in-plane anisotropies of the two systems were obtained. We found large additional higher order anisotropies (uniaxial and four-fold) in the system due to ferromagnet (FM)- antiferromagnet (AF) exchange bias coupling. These anisotropies show a linear dependence on the inverse FM thickness indicating their interfacial origin caused by exchange bias effect. The thickness dependence of the exchange bias fields H-ex and the coercivity H-c also exhibited a linear dependence on the inverse FM layer thickness. (C) 2000 Elsevier Science S.A. All rights reserved. CR AMBROSE T, 1997, PHYS REV B, V56, P83 DIMITROV DV, 1998, PHYS REV B, V58, P12090 FARROW RFC, 1997, J APPL PHYS 2B, V81, P4986 IJIRI Y, 1998, PHYS REV LETT, V80, P608 KISHI H, 1996, IEEE T MAGN 1, V32, P3380 KOON NC, 1997, PHYS REV LETT, V78, P4865 MALOZEMOFF AP, 1988, J APPL PHYS, V63, P3874 MALOZEMOFF AP, 1988, PHYS REV B, V37, P7673 MALOZEMOFF AP, 1987, PHYS REV B, V35, P3679 MAURI D, 1987, J APPL PHYS, V62, P3047 MEIKLEJOHN WH, 1957, PHYS REV, V105, P904 MEIKLEJOHN WH, 1956, PHYS REV, V102, P1413 MEWES T, 1998, THESIS U KAISERSLAUT MORAN TJ, 1998, APPL PHYS LETT, V72, P617 RIEDLING S, 1999, J APPL PHYS, V85, P6648 SCHULTHESS TC, 1998, PHYS REV LETT, V81, P4516 WIJN HPJ, 1991, DATA SCI TECHNOLOGY, P81 TC 0 BP 59 EP 62 PG 4 JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PY 2000 PD JUN 15 VL 76 IS 1 GA 320AK J9 MATER SCI ENG B-SOLID STATE M UT ISI:000087378700017 ER PT Journal AU Pavkov, M Skrinjar, M Kapor, D Stojanovic, S TI The effect of a surface on the dynamic and thermodynamic properties of S=1 Heisenberg ferromagnet with biquadratic exchange SO PHYSICA A NR 17 AB Properties of semi-infinite (S = 1) Heisenberg ferromagnet with biquadratic exchange were studied in terms of surface exchange (epsilon = I-S/I) and biquadratic coupling (a). It was shown that a strict correlation exists, depending on epsilon, between the type of surface spin waves (acoustic or optical) and the mean-field (MF) critical temperature, bulk (T-c) and surface T- c(S) > T-c (for epsilon > 5/4). Within the Framework of the Landau-Ginsburg theory for semi-infinite simple cubic ferromagnet, a detailed study is presented of the critical behaviour of the system, in particular in the vicinity of the tricritical point which is the consequence of the biquadratic interaction. It is shown that tricritical exponents satisfy exactly the scaling relations for d = 3. The analysis of the spin-spin correlation function within the framework of the same theory, shows that there occurs the critical magnetic scattering of low-energy electrons (LEED) from the surface in the case epsilon greater than or equal to 5/4, when the ordering temperature T-c(S) is approached from above (from paramagnetic phase). In the opposite case, epsilon < 5/4, there occurs no surface critical scattering. It was also shown that in the vicinity of the tricritical point, the biquadratic interaction increases the range of validity of the MF approximation. (C) 2000 Elsevier Science B.V. All rights reserved. CR CELIC A, 1996, PHYS LETT A, V219, P121 COTTAM MG, 1989, INTRO SURFACE SUPERL COTTAM MG, 1984, J PHYS C SOLID STATE, V17, P1793 COTTAM MG, 1976, J PHYS C SOLID STATE, V9, P2121 DEMORAES JNB, 1993, PHYS REV B, V47, P8695 ECONOMOU EN, 1979, GREENS FUNCTION QUAN KAPOR D, 1994, PHYS LETT A, V192, P413 LAZAREV S, 1998, PHYSICA A, V250, P453 MA SK, 1976, MODERN THEORY CRITIC MATTIS DC, 1988, THEORY MAGNETISM, V1 MATVEEV VM, 1973, ZH EKSP TEOR FIZ, V65, P1626 MILLS DL, 1971, PHYS REV B, V3, P3887 PATASHINSKIY AZ, 1982, FLUCTATION THEORY PH PAVKOV M, 1997, PHYS LETT A, V236, P148 SHEN WZ, 1992, PHYS LETT A, V168, P151 WEGNER FJ, 1973, PHYS REV B, V7, P248 WOLFRAM T, 1972, PROG SURF SCI, V2, P233 TC 0 BP 465 EP 483 PG 19 JI Physica A PY 2000 PD JUN 1 VL 280 IS 3-4 GA 315DA J9 PHYSICA A UT ISI:000087096300019 ER PT Journal AU Safonov, VL Bertram, HN TI Intrinsic mechanism of nonlinear damping in magnetization reversal SO JOURNAL OF APPLIED PHYSICS NR 12 AB The process of magnetization reversal in a fine ferromagnetic grain with a strong uniaxial anisotropy has been simulated for the case of an instantaneously applied reversal magnetic field. The "quasi" single-domain grain was considered as a system of 64 or 1000 subcubes coupled by exchange and dipole-dipole interactions. The system of Landau-Lifshitz equations was numerically solved without any phenomenological damping terms. The dynamic process is characterized by a rapid magnetization reversal accompanied by a decrease in the average magnetization. The system exhibits a nonlinear excitation of nonuniform magnetic oscillations (spin waves) driven by the uniform mode. We found limitations on magnetization reversal for small grain size and large applied field magnitude. The damping parameter has been obtained for small magnetization oscillations. (C) 2000 American Institute of Physics. [S0021- 8979(00)66008-5]. CR CHIRIKOV BV, 1979, PHYS REP, V52, P265 GUREVICH AG, MAGNETIZATION OSCILL IGARASHI M, 1999, J APPL PHYS 2A, V85, P4720 INABA N, 1997, IEEE T MAGN 1, V33, P2989 NAKATANI Y, 1994, JPN J APPL PHYS PT 1, V33, P6546 PRESS WH, 1986, NUMERICAL RECIPES SAFONOV VL, 1999, CONDMAT9912014 SAFONOV VL, 1999, J APPL PHYS 2A, V85, P5072 SCHABES ME, 1988, J APPL PHYS, V64, P1347 SPARKS M, 1909, FERROMAGNETIC RELAXA SUHL H, 1998, IEEE T MAGN 1, V34, P1834 UESAKA Y, 1991, JPN J APPL PHYS PT 1, V30, P2489 TC 2 BP 5508 EP 5510 PG 3 JI J. Appl. Phys. PY 2000 PD MAY 1 VL 87 IS 9 PN 2 GA 308RT J9 J APPL PHYS UT ISI:000086727200270 ER PT Journal AU Le Gall, H Youssef, JB Socha, F Tiercelin, N Preobrazhensky, V Pernod, P TI Low field anisotropic magnetostriction of single domain exchange-coupled (TbFe/Fe) multilayers SO JOURNAL OF APPLIED PHYSICS NR 6 AB Giant magnetostriction (GMS) reported until now in exchange- coupled multilayers (ECML) present quasi-isotropic magnetostrictive behavior. In the present work it is shown the possibility to induce highly anisotropic GMS at low field with the single domain state in (TbFe/Fe)(n) multilayers when deposited by ion sputtering under a magnetic polarization field H-d. ECML grown under bias field H-d, applied along the large size of rectangular glass substrates present original magnetic and magnetoelastic (ME) properties associated with strong uniaxial behavior. After saturation by an external field H- parallel to applied parallel to the easy axis induced by H-d, a single domain state is kept by decreasing H-parallel to down to zero (Mr/Ms = 1) which explains why there is no change of the magnetoelastic coefficient b(gamma,2) by increasing or decreasing H-parallel to. A different behavior arises along the hard magnetization axis with a strong change of b(gamma,2) by increasing H-parallel to up to the saturation. ME anisotropy is the origin of high amplitude flexural and torsional oscillation modes as observed in our ECML. (C) 2000 American Institute of Physics. [S0021-8979(00)81908-8]. CR DUTREMOLETDELAC. E, 1994, J MAGN MAGN MAT, V136, P189 OZHOGIN VI, 1991, J MAGN MAGN MATER, V100, P544 QUANDT E, 1997, J ALLOY COMPD, V258, P126 QUANDT E, 1997, J ALLOY COMPD, V258, P133 TIERCELIN N, 2000, J MAGN MAGN MATER, V210, P302 TIERCELIN N, 2000, SENSOR ACTUAT A-PHYS, V81, P162 TC 0 BP 5783 EP 5785 PG 3 JI J. Appl. Phys. PY 2000 PD MAY 1 VL 87 IS 9 PN 2 GA 308RT J9 J APPL PHYS UT ISI:000086727200360 ER PT Journal AU Liu, CX Yu, CT Jiang, HM Shen, LY Alexander, C Mankey, GJ TI Effect of interface roughness on the exchange bias for NiFe/FeMn SO JOURNAL OF APPLIED PHYSICS NR 14 AB The effect of interface roughness on exchange bias for NiFe/FeMn bilayers is investigated for polycrystalline films and epitaxial films. Three different systems were investigated: polycrystalline Ta (10 nm)/Ni80Fe20 (10nm)/Fe50Mn50 (20 nm) films on oxygen plasma-etched Si(100) or Cu/H-Si(100) and epitaxial Ni80Fe20 (10nm)/Fe60Mn40 (20 nm) films on Cu/H- Si(110). For films grown on plasma-etched substrates, as the etching time is increased, film roughness increases up to 12 nm. For the polycrystalline films grown on ultrathin Cu underlayers, x-ray diffraction shows the fcc (111) texture is greatly reduced as the thickness is increased. The epitaxial Cu/Si(110) buffer layer induces fcc (111) epitaxial growth and modifies the interface morphology. The dependence of exchange bias on roughness for each set of samples is explained in terms of a competition between the interfacial exchange coupling and the af uniaxial anisotropy. (C) 2000 American Institute of Physics. [S0021-8979(00)93708-3]. CR ERNST HJ, 1994, PHYS REV LETT, V72, P112 HOU C, 1999, THESIS HWANG DG, 1998, APPL PHYS LETT, V72, P2162 JIANG H, 1998, THIN SOLID FILMS, V315, P13 JUNGBLUT R, 1994, J APPL PHYS, V75, P6659 KOON NC, 1997, PHYS REV LETT, V78, P4865 LI M, 1998, J APPL PHYS, V83, P5313 MALOZEMOFF AP, 1988, J APPL PHYS, V63, P3874 MAURI D, 1987, J APPL PHYS, V62, P3047 MEIKLEJOHN WH, 1956, PHYS REV, V102, P1413 NOGUES J, 1996, APPL PHYS LETT, V68, P3186 PARK CM, 1996, J APPL PHYS 2B, V79, P6228 YANG HN, 1993, DIFFRACTION ROUGH SU ZUO JK, 1997, PHYS REV LETT, V78, P2791 TC 0 BP 6644 EP 6646 PG 3 JI J. Appl. Phys. PY 2000 PD MAY 1 VL 87 IS 9 PN 3 GA 308TK J9 J APPL PHYS UT ISI:000086728800247 ER PT Journal AU Lobkis, OI Chimenti, DE Zhang, H TI In-plane elastic property characterization in composite plates SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA NR 32 AB This article presents a method to deduce the in-plane elastic properties of multilayered composite plates. Drawing on a synthetic-aperture technique developed for the elucidation of materials properties in air-coupled ultrasonics, this new method exploits the high elastic anisotropy of composite materials to permit an accurate measurement of directional in- plane stiffness. It is found that comparisons of experimental measurements with plate stiffnesses calculated on the basis of lamination theory agree to within several percent for uniaxial and biaxial laminates and to within 10 percent for quasi- isotropic laminates. It is further shown that the method is largely insensitive to transducer deployment angle within a range related to the transducer beamwidth. (C) 2000 Acoustical Society of America. [S0001-4966(00)05703-9]. CR BARCOHEN Y, 1993, MATER EVAL, V51, P1285 CHIMENTI DE, 1997, APPL MECH REV, V50, P247 CHIMENTI DE, 1985, J APPL PHYS, V58, P4531 CHIMENTI DE, 1990, J NONDESTRUCT EVAL, V9, P51 DAYAL V, 1989, J ACOUST SOC AM, V85, P2268 DEGERTEKIN FL, 1996, J ACOUST SOC AM, V99, P299 DESCHAMPS M, 1992, J ACOUST SOC AM, V91, P2007 DITRI JJ, 1995, J ACOUST SOC AM, V97, P98 DITRI JJ, 1994, J APPL MECH-T ASME, V61, P330 EVERY AG, 1996, ULTRASONICS, V34, P471 KING RB, 1983, ULTRASONICS, V21, P256 KLINE RA, 1990, J ENG MATER-T ASME, V112, P218 KUNDU T, 1993, J ACOUST SOC AM, V93, P3066 LANDAU LD, 1986, THEORY ELASTICITY, P39 LOBKIS OI, 1996, J ACOUST SOC AM, V99, P2727 LOBKIS OI, 1998, REV PROGR QUANTITATI, V17, P1139 MINACHI A, 1994, J ACOUST SOC AM, V96, P353 NAYFEH AH, 1995, WAVE PROPAGATION LAY NORRIS AN, 1989, Q J MECH APPL MATH, V42, P413 PARK H, 1994, EXP MECH, V34, P148 PETERSEN GL, 1994, REV SCI INSTRUM, V65, P192 PIALUCHA T, 1989, ULTRASONICS, V27, P270 PROSSER WH, 1994, J ACOUST SOC AM, V96, P902 ROKHLIN SI, 1993, J ACOUST SOC AM, V94, P2721 ROKHLIN SI, 1992, J ACOUST SOC AM, V91, P3303 ROSE JL, 1993, J REINF PLAST COMP, V12, P536 SAFAEINILI A, 1996, IEEE T ULTRASON FERR, V43, P1171 SEALE MD, 1998, J ACOUST SOC AM 1, V103, P2416 TSAI SW, 1980, INTRO COMPOSITE MAT VEIDT M, 1994, J ACOUST SOC AM, V96, P2318 WEAVER RL, 1994, J APPL MECH-T ASME, V61, P429 WU TT, 1994, ULTRASONICS, V32, P21 TC 0 BP 1852 EP 1858 PG 7 JI J. Acoust. Soc. Am. PY 2000 PD APR VL 107 IS 4 GA 302LR J9 J ACOUST SOC AMER UT ISI:000086367000004 ER PT Journal AU Voltairas, PA Fotiadis, DI Massalas, CV TI Magnetization reversal in thin ferromagnetic films under mechanical stress SO INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE NR 35 AB A simple micromagnetic model is presented to study the effect of stress on the magnetization reversal in thin ferromagnetic films ( well-known as inverse magnetostrictive effect). To simplify the calculations the plane strains are confined to be uniform. The externally applied magnetic field is oriented either, parallel or perpendicular to the stress direction. For coherent magnetization reversal, analytical relations between coercivity and stress and remanence and stress were obtained. The nucleation modes and fields for nonuniform, one-dimensional magnetization reversal were calculated. From our analysis we conclude that the stress dependence of coercivity is qualitatively the same with related experiments. (C) 2000 Elsevier Science Ltd. All rights reserved. CR AHARONI A, 1996, INTRO THEORY FERROMA AHARONI A, 1996, INTRO THEORY FERROMA, P221 BORNSTEIN L, 1962, MAGNETIC PROPERTIES, V3 BOZORTH RM, 1951, FERROMAGNETISM, P648 BROWN WF, 1963, MICROMAGNETICS BROWN WF, 1962, PHYS REV, V125, P85 BROWN WF, 1966, SPRINGER TRACTS NATU, V9 CALLEGARO L, 1996, APPL PHYS LETT, V68, P1279 CALLEGARO L, 1997, IEEE T MAGN 1, V33, P1007 CULLEN JR, 1997, J APPL PHYS 2B, V81, P5417 DESIMONE A, 1993, ARCH RATION MECH AN, V125, P99 DESIMONE A, 1997, J APPL PHYS 2B, V81, P5706 DESIMONE A, 1994, J INTELLIGENT MAT SY, V5, P787 ERINGEN AC, 1990, ELECTRODYNAMICS CONT, V1 HAN DH, 1997, APPL PHYS LETT, V70, P664 HAN DH, 1997, J APPL PHYS 2A, V81, P4519 JAMES RD, 1990, CONT MECH THERMODYN, V2, P215 JAMES RD, 1993, PHILOS MAG B, V68, P237 MASSALAS CV, 1991, INT J ENG SCI, V29, P1217 MASSALAS CV, 1994, J MAGN MAGN MATER, V135, P271 MAUGIN GA, 1988, CONTINUUM MECH ELECT MAUGIN GA, 1975, CONTINUUM PHYSICS, V2, P221 MAUGIN GA, 1976, J MATH PHYS, V17, P1739 MAUGIN GA, 1972, J MATH PHYS, V13, P143 MAUGIN GA, 1972, J MATH PHYS, V13, P1334 MISRA A, 1990, J MAG MAG MAT, V89, P159 MOON FC, 1984, MAGNETO SOLID MECH, P37 MOTOGI S, 1993, J PHYS D APPL PHYS, V26, P1459 MOTOGI S, 1993, MATER SCI FORUM, V257, P123 PUPPIN E, 1996, IEEE T MAGN, V32, P281 SELF WB, 1972, J APPL PHYS, V43, P199 STONER EC, 1948, PHILOS T ROY SOC A, V240, P599 TIERSTEN HF, 1965, J MATH PHYS, V6, P779 TIERSTEN HF, 1964, J MATH PHYS, V5, P1298 VOLTAIRAS PA, 1994, THESIS U IOANNINA TC 0 BP 903 EP 919 PG 17 JI Int. J. Eng. Sci. PY 2000 PD MAY VL 38 IS 8 GA 303DN J9 INT J ENG SCI UT ISI:000086405700006 ER PT Journal AU Szymanski, B Stobiecki, F TI Magnetic properties and GMR of sputtered permalloy/Au multilayers SO ACTA PHYSICA POLONICA A NR 7 AB We report on structural, magnetic, and GMR properties of permalloy/Au multilayers where permalloy = Ni83Fe17, deposited by face-to-face sputtering onto Si(111) substrate. X-ray diffraction studies confirmed a good structural quality of our multilayers. The samples were characterised with vibrating sample magnetometer, longitudinal magnetooptical Kerr effect and giant magnetoresistance measurements. It was determined that our multilayers are magnetically very soft with H-c approximate to 1 Oe and show uniaxial anisotropy with H-K approximate to 5 Oe. For gold sublayer thickness d(Au) close to 1.1 nm the antiferromagnetic coupling is present in very narrow Au thickness range (approximate to 0.2 nm). Despite a good structural quality of samples relatively small giant magnetoresistance value (1.2% at loom temperature) was found. It is due to non-perfect aniferromagnetic coupling caused by pinholes. CR BASZYNSKI J, 1994, PHYS STATUS SOLIDI A, V141, PK23 FULGHUM DB, 1995, PHYS REV B, V52, P13435 LUCINSKI T, 1997, J MAGN MAGN MATER, V174, P192 LUCINSKI T, 1998, J PHYS IV, V8, P453 PARKIN SSP, 1996, APPL PHYS LETT, V68, P1162 PARKIN SSP, 1994, PHYS REV LETT, V72, P3718 STOBIECKI F, 1999, J MAGN SOC JAPAN, V23, P176 TC 0 BP 535 EP 538 PG 4 JI Acta Phys. Pol. A PY 2000 PD MAR VL 97 IS 3 GA 299HN J9 ACTA PHYS POL A UT ISI:000086193100043 ER PT Journal AU Marrows, CH Stanley, FE Hickey, BJ TI Angular dependence of characteristic fields in spin-valves SO SENSORS AND ACTUATORS A-PHYSICAL NR 14 AB Spin-valves are commonly characterised by a series of representative field values such as the coercivity of the magnetic layers, the exchange bias field and the interlayer coupling field. As the angle of an applied field is varied, these values have been observed to vary as periodic functions containing many high order harmonic terms. We analyse the magnetic behaviour of a spin-valve in terms of an extended Stoner-Wohlfarth model, and show that only the fundamental terms are necessary in the free energy of the system for these complex angular dependences to arise. We present illustrative data for spin-valve multilayer films. The complex angular dependences are seen to arise when the unidirectional and uniaxial energy terms are of comparable size, as in the free layer of a weakly coupled spin-valve. (C) 2000 Elsevier Science S.A. All rights reserved. CR AMBROSE T, 1997, PHYS REV B, V56, P83 DIENY B, 1991, PHYS REV B, V43, P1297 HASE TPA, 1998, IEEE T MAGN 1, V34, P831 LABRUNE M, 1997, J MAGN MAGN MATER, V171, P1 MALLINSON JC, 1996, MAGNETORESISTIVE HEA, P105 MIDDELHOEK S, 1961, THESIS AMSTERDAM MILLER MM, 1997, IEEE T MAGN 1, V33, P3388 NISHIOKA K, 1995, IEEE T MAGN, V31, P3949 PARKER MR, 1995, IEEE T MAGN, V31, P2618 RIJKS TGSM, 1994, J APPL PHYS, V76, P1092 SLONCZEWSKI JC, 1956, IBM INTERNAL REPORT STONER EC, 1991, IEEE T MAGN, V27, P3475 TANG DD, 1995, IEEE T MAGN, V31, P3206 TSANG C, 1994, IEEE T MAGN, V30, P3801 TC 0 BP 49 EP 52 PG 4 JI Sens. Actuator A-Phys. PY 2000 PD APR 1 VL 81 IS 1-3 GA 295KP J9 SENSOR ACTUATOR A-PHYS UT ISI:000085965500012 ER PT Journal AU Kalmykov, YP TI Longitudinal dynamic susceptibility and relaxation time of superparamagnetic particles with cubic anisotropy: Effect of a biasing magnetic field SO PHYSICAL REVIEW B NR 31 AB The magnetic relaxation of single domain ferromagnetic particles with cubic magnetic anisotropy subjected to a strong uniform magnetic held is treated by averaging the Gilbert- Langevin equation for an individual particle, so that the system of linear differential-recurrence equations for the appropriate equilibrium correlation functions is derived. The solution of this system (in terms of matrix continued fractions) is obtained and the longitudinal relaxation time tau(parallel to) of the magnetization and spectrum of the complex magnetic susceptibility chi(parallel to)(omega) are evaluated. It is shown that the depletion effect discovered for uniaxial particles by Coffey et al. [Phys. Rev. B 51, 15 947 (1995)] and interpreted by Garanin [Phys. Rev. E 54, 3250 (1996)] also exists for particles having a cubic anisotropy. This effect consists of the drastic deviation of tau(parallel to) from the inverse of the smallest nonvanishing eigenvalue (lambda(1)(-1)) of the Fokker-Planck equation in the low temperature limit starting from some critical values h(c) of the ratio bias field parameter/anisotropy barrier height parameter and is due to depletion of the upper (shallow) potential well involved into the relaxation process. For uniaxial particles the critical value is known to be h(c)approximate to 0.17. For cubic crystals it is shown that h(c)approximate to 0.3 (for positive anisotropy constant, Fe- type) and h(c)approximate to 0.1 (for negative anisotropy constant, Ni-type). However, it is also demonstrated, in contrast to uniaxial particles, that for cubic crystals there is an inherent geometric dependence of the complex susceptibility and the relaxation time on the damping parameter arising from the coupling of longitudinal and transverse relaxation modes. 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Rev. B PY 2000 PD MAR 1 VL 61 IS 9 GA 290ZE J9 PHYS REV B UT ISI:000085707100065 ER PT Journal AU Layadi, A TI Resonance modes of cubic single crystal thin film with exchange anisotropy: A theoretical study SO JOURNAL OF APPLIED PHYSICS NR 19 AB Ferromagnetic resonance (FMR) modes of exchange coupled bilayer thin films have been studied. The interfacial exchange anisotropy is modeled as a magnetic field H-E. The ferromagnetic film is taken to be a single crystal with cubic and uniaxial magnetocrystalline anisotropies. The effect of the applied magnetic field H, the exchange anisotropy field H-E, and the cubic anisotropy on the mode behavior will be shown. It will be shown how the FMR linewidth relates to the exchange anisotropy. The angular dependence of the resonance frequency and frequency linewidth will be studied. (C) 2000 American Institute of Physics. [S0021-8979(00)07503-4]. 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PY 2000 PD FEB 1 VL 87 IS 3 GA 275LV J9 J APPL PHYS UT ISI:000084822400063 ER PT Journal AU Moraitis, G Khan, MA Dreysse, H Demangeat, C TI Spin-flop transition in FenCrm superlattices SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS NR 12 AB Parallel and antiparallel configurations at Fe/Cr interfaces are discussed within the TB-LMTO method. A parallel configuration is shown to be the ground state in the ordered B2Fe0.5Cr0.5 alloy whereas an antiparallel configuration is shown to be present when the lattice parameter is increased by 5%, For Fe1Cr2 superlattices a similar spin-flop arises when the lattice parameter is increased only by 2%. CR ANDERSEN OK, 1984, PHYS REV LETT, V53, P2571 BERGER A, 1994, PHYS REV LETT, V73, P193 BOUZAR H, COMMUNICATION MML 95 HERMAN F, 1991, J APPL PHYS, V69, P4783 HICKEN RJ, 1996, IN PRESS PHYS REV B MORONI EG, 1993, PHYS REV B, V47, P3255 MORUZZI VL, 1992, PHYS REV B, V46, P2864 SINGH DJ, 1994, J APPL PHYS, V76, P6688 STOEFFLER D, 1995, MATER RES SOC SYMP P, V384, P247 TURTUR C, 1994, PHYS REV LETT, V72, P1557 VEGA A, COMMUNICATION MML 95 VEGA A, 1995, EUROPHYS LETT, V31, P561 TC 8 BP 250 EP 252 PG 3 JI J. Magn. Magn. Mater. PY 1996 PD APR VL 156 IS 1-3 GA UV358 J9 J MAGN MAGN MATER UT ISI:A1996UV35800104 ER PT Journal AU Yao, YD Liou, Y Huang, JCA Liao, SY Klik, I Yang, WT Chang, CP Lo, CK TI Enhancement of magnetoresistance in Co(1(1)over-bar-00)/Cr(211) bilayered films on MgO(110) SO JOURNAL OF APPLIED PHYSICS NR 7 AB Epitaxial Co/Cr bilayered films have been successfully grown on the MgO(100) and MgO(110) substrates by molecular-beam epitaxy. According to the reflection high-energy electron-diffraction and x-ray-diffraction measurements the crystal structure of the film depends on orientation of the buffer and substrate. Epitaxial growth of biaxial Co(<11(2)over bar 0>)/Cr(100) on MgO(100) substrate and of uniaxial Co(<1(1)over bar 00>)/Cr(211) on MgO(110) substrate has been confirmed. The anisotropy magnetoresistance (AMR) is strongly influenced by the orientation of the Cr buffer. In Co(<11(2)over bar 0>)/Cr(100) on MgO(100) AMR is isotropic for all in-plane fields. However, for Co(<1(1)over bar 00>)/Cr(211) on MgO(110) we observed enhancement of AMR along the easy axis for temperatures below 150 K, while along the hard axis AMR has a local maximum at about 150 K. The easy axis data suggest that the longitudinal spin density wave of Cr and the crystal anisotropy of Co on Cr(211) plane dominate the enhancement of the AMR. (C) 1996 American Institute of Physics. CR BAIBICH MN, 1988, PHYS REV LETT, V61, P2472 BERGER A, 1994, PHYS REV LETT, V73, P193 HUANG JCA, 1995, PHYS REV B, V52, PR1310 LIOU Y, 1995, IEEE T MAGN, V31, P3927 LIOU Y, 1994, J APPL PHYS, V76, P6516 PARKIN SSP, 1990, PHYS REV LETT, V64, P2304 YAO YD, 1994, CHINESE J PHYS, V32, P863 TC 3 BP 6533 EP 6535 PG 3 JI J. Appl. Phys. PY 1996 PD APR 15 VL 79 IS 8 PN 2B GA UG878 J9 J APPL PHYS UT ISI:A1996UG87800353 ER PT Journal AU VEGA, A STOEFFLER, D DREYSSE, H DEMANGEAT, C TI MAGNETIC-ORDER TRANSITION IN THIN FE OVERLAYERS ON CR - ROLE OF THE INTERFACIAL ROUGHNESS SO EUROPHYSICS LETTERS NR 23 AB The distribution of magnetic domains in a thin Fe overlayer on Cr is calculated as a function of the coverage thickness in the presence of roughness at the interface. The spin-polarized electronic structure is determined by solving self-consistently a d-band model Hamiltonian in the mean-field approximation. Arising from a magnetic multidomain arrangement, a zero total magnetic moment is obtained when starting the Fe deposition. A transition towards a single Fe domain at a critical coverage thickness leads to a net magnetization in qualitative agreement with various experimental observations. This macroscopic magnetic behaviour is traced back to environment-dependent microscopic properties such as the local magnetic moments and magnetic ordering. 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Lett. PY 1995 PD SEP 20 VL 31 IS 9 GA RX761 J9 EUROPHYS LETT UT ISI:A1995RX76100010 ER PT Journal AU SONNTAG, P BODEKER, P THURSTON, T ZABEL, H TI CHARGE-DENSITY WAVES AND STRAIN WAVES IN THIN EPITAXIAL CR(001) FILMS ON NB SO PHYSICAL REVIEW B NR 28 AB We have investigated the magnetic structure of thin epitaxial (001)-oriented Cr films grown on a Nb buffer layer on sapphire. By means of x-ray diffraction measurements the charge density waves (CDW) and strain waves (SW) in Cr films with thicknesses between 500 and 3000 Angstrom have been studied. The results show that there exists an orientational pinning effect at both the Cr surface and the interface between Cr and the Nb buffer layer which causes an enlargement of the CDW-SW period, and a single a domain mode having a q vector pointing perpendicular to the surface. This pinning behavior relaxes with increasing film thickness. 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