FN ISI Export Format VR 1.0 PT J AU HARDNER, HT WEISSMAN, MB PARKIN, SSP TI HISTORY DEPENDENT DOMAIN-STRUCTURES IN GIANT-MAGNETORESISTIVE MULTILAYERS SO APPLIED PHYSICS LETTERS AB Resistance noise measurements of several types reveal the field history dependence of domain structure in sputtered Co/Cu multilayers. We find many smaller domains as the field is decreased from saturation towards zero, but as the field changes sign and is increased in the opposite direction we observe a smaller number of larger domains. Cycling the field without changing its sign preserves the smaller domains, strongly reducing the Barkhausen noise, Discrete fluctuations in resistance due to individual domains yield domain size estimates. (C) 1995 American Institute of Physics. BP 1938 EP 1940 PG 3 JI Appl. Phys. Lett. PY 1995 PD SEP 25 VL 67 IS 13 GA RW225 J9 APPL PHYS LETT UT ISI:A1995RW22500049 ER PT J AU DABOO, C BLAND, JAC HICKEN, RJ IVES, AJR BAIRD, MJ WALKER, MJ TI VECTORIAL MAGNETOMETRY WITH THE MAGNETOOPTIC KERR EFFECT APPLIED TO CO/CU/CO TRILAYER STRUCTURES SO PHYSICAL REVIEW B-CONDENSED MATTER AB We describe an arrangement in which the magnetization components parallel and perpendicular to the applied field are both determined from longitudinal magneto-optic Kerr effect measurements. This arrangement differs from the usual procedures in that the same optical geometry is used but the magnet geometry altered. This leads to two magneto-optic signals which are directly comparable in magnitude thereby giving the in-plane magnetization vector directly. We show that it is of great value to study both in-plane magnetization vector components when studying coupled structures where significant anisotropies are also present. We discuss simulations which show that it is possible to accurately determine the coupling strength in such structures by examining the behavior of the component of magnetization perpendicular to the applied field in the vicinity of the hard in-plane anisotropy axis. We illustrate this technique by examining the magnetization and magnetic anisotropy behavior of ultrathin Co/Cu(111)/Co (d(Cu)=20 angstrom and 27 angstrom) trilayer structures prepared by molecular beam epitaxy, in which coherent rotation of the magnetization vector is observed when the magnetic field B is applied along the hard in-plane anisotropy axis, with the magnitude of the magnetization vector constant and close to its bulk value. Results of micromagnetic calculations closely reproduce the observed parallel and perpendicular magnetization loops, and yield strong uniaxial magnetic anisotropies in both layers, while the interlayer coupling appears to be absent or negligible in comparison with the anisotropy strengths. BP 11852 EP 11859 PG 8 JI Phys. Rev. B-Condens Matter PY 1993 PD MAY 1 VL 47 IS 18 GA LD189 J9 PHYS REV B-CONDENSED MATTER UT ISI:A1993LD18900026 ER PT J AU FUSS, A WOLF, JA GRUNBERG, PA TI EXCHANGE OF FE LAYERS ACROSS INTERLAYERS WITH GOOD MATCH SO PHYSICA SCRIPTA AB The exchange interaction of Fe across interlayers X, X = Cr, Au, Ag and Al has been investigated by means of M(H) curves and lightscattering from spinwaves. For these investigations Fe/X/Fe structures were grown with as good epitaxy and crystallinity as possible, which is documented by in situ RHEED investigations. For the coupling across Cr and Au we find oscillations as a function of the interlayer thickness with a long and a short period. For Al interlayers only long periods can be clearly resolved and for Ag no oscillations have been observed. Apart from the oscillations between ferro- and antiferromagnetic type coupling we find also contributions of 90-degrees type coupling which aligns the magnetic films perpendicular to each other. The temperature dependence of 90- degrees coupling has been investigated in the case of Au interlayers. BP 95 EP 98 PG 4 JI Phys. Scr. PY 1992 VL T45 GA JU377 J9 PHYS SCR UT ISI:A1992JU37700022 ER PT J AU FOLKERTS, W PURCELL, ST TI ANTIFERROMAGNETICALLY COUPLED MULTILAYER SYSTEMS - MAGNETIZATION CURVES IN THE CASE OF UNEQUAL THICKNESSES OF THE MAGNETIC LAYERS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS AB The magnetization behaviour of an antiferromagnetically coupled metallic multilayer system is often more complicated than a simple switch from antiparallel to parallel alignment. In this article we calculate and discuss magnetization loops for such systems. In particular, we study the magnetization behaviour for unequal thicknesses of the ferromagnetic layers involved. In the case when one of the ferromagnetic layers is very thick, we demonstrate that the experimental magnetization loops can be understood by assuming that a partial domain wall can be induced into the thick layer. It is also shown how the magnitude of the antiferromagnetic coupling can be derived from experimental magnetization curves. BP 306 EP 312 PG 7 JI J. Magn. Magn. Mater. PY 1992 PD JUN VL 111 IS 3 GA JJ482 J9 J MAGN MAGN MATER UT ISI:A1992JJ48200013 ER PT J AU GRUNBERG, P DEMOKRITOV, S FUSS, A SCHREIBER, R WOLF, JA PURCELL, ST TI INTERLAYER EXCHANGE, MAGNETOTRANSPORT AND MAGNETIC DOMAINS IN FE/CR LAYERED STRUCTURES SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS AB The exchange coupling of Fe across Cr oscillates as a function of the Cr-thickness with a short and a long period. The short- period oscillations are only observed in samples with very good quality. In addition to ferro- and antiferromagnetic type coupling there is also a contribution favouring a perpendicular magnetization alignment of neighbouring magnetic films. Similar effects as for the Fe/Cr system we find also for Fe/Au and Fe/Al. For the Fe/Ag system AF type coupling could not be established. The effect of the various types of coupling on magnetic domains has been studied in the Fe/Cr system. An analysis of the new magnetoresistance effect due to antiparallel alignment revealed that for the Fe/Cr system it is due to a spindependent electron scattering at the Fe-Cr interfaces. Values for the scattering rates have been obtained. BP 1734 EP 1738 PG 5 JI J. Magn. Magn. Mater. PY 1992 PD FEB VL 104 PN 3 GA HH328 J9 J MAGN MAGN MATER UT ISI:A1992HH32800106 ER