Go to ScienceDirect® Home Skip Main Navigation Links Register or Login: Password: Home Search Browse Journals Browse Abstract Databases Browse Books Browse Reference Works My Profile Alerts Help (Opens New Window) Quick Search: within Quick Search searches abstracts, titles, keywords, and authors. Click here for more information. Results List Previous 33 of 59 Next Physica B: Condensed Matter Volume 283, Issues 1-3 , June 2000, Pages 162-166 This Document SummaryPlus Full Text + Links PDF (227 K) Actions Cited By Save as Citation Alert E-mail Article Export Citation doi:10.1016/S0921-4526(99)01920-1 How to Cite or Link Using DOI (Opens New Window) Copyright © 2000 Elsevier Science B.V. All rights reserved. Polarized neutron reflectivity characterization of weakly coupled Co/Cu multilayers J. A. BorchersCorresponding Author Contact Information <#m4.cor*>, E-mail The Corresponding Author , a <#orfa>, J. A. Duraa <#orfa>, C. F. Majkrzaka <#orfa>, S. Y. Hsub <#orfb>, R. Loleeb <#orfb>, W. P. Prattb <#orfb> and J. Bassb <#orfb> a NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive STOP 8562, Gaithersburg, MD 20899-8562, USA b Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA Available online 10 April 2000. Abstract Room temperature resistivity studies on (1 1 1) Co(6 nm)/Cu(6 nm) multilayers with weak interlayer coupling yield a giant magnetoresistance (GMR) of several percent for the as-prepared state relative to the saturated (i.e., large magnetic field) state. After application of a magnetic field, the magnetoresistance for the coercive state is only half to two-thirds as large. Using specular and off-specular polarized neutron reflectivity, we have determined the magnetic structure of these multilayers in the as-prepared and coercive states. Measurements of as-prepared samples show a strong antiparallel correlation of in-plane ferromagnetic Co domains across the Cu interlayers. At the coercive field, the Co domains are uncorrelated along the growth direction. Thus, the larger GMR for the as-prepared state arises from long-range antiparallel magnetic order along the growth-axis direction that is destroyed upon application of a magnetic field. For both the as-prepared and coercive states, the size of the in-plane ferromagnetic domains is approximately 0.5–1.5 small mu, Greekm. These domains give rise to pronounced diffuse scattering in rocking curves through the antiferromagnetic peak position. Author Keywords: Giant magnetoresistance; Magnetic multilayer; Off-specular scattering; Magnetic domains; Polarized neutron reflectivity Article Outline • Acknowledgements • References Enlarge Image (5K) Fig. 1. Specular PNR as a function of Qz=(4small pi, Greek/small lambda, Greek) sin straight theta, small theta, Greek for [Co(6 nm)|Cu(6 nm)]20 in the as-prepared state in a 1.5 Oe field. The diffuse scattering has been subtracted, and the data have been corrected for the polarization efficiencies. The open and shaded circles correspond to the (−−) and (++) data respectively. The open and shaded squares designate the (+−) and (−+) data. The arrows point to the appropriate vertical axis for the NSF and SF data. Enlarge Image (7K) Fig. 2. Total PNR (shaded symbols) relative to the diffuse scattering (open symbols) for [Co(6 nm)|Cu(6 nm)]20 and [Co(6 nm)|Cu(6 nm)]20 (#2) in the as-prepared state. The diffuse scattering was measured by offsetting the angle straight theta, small theta, Greek by a small amount and then scanning Qz. The circles and squares correspond to (−−) and (++) data, respectively. The up and down triangles mark (+−) and (−+). No data corrections have been made. The arrows designate the vertical axis for each cross section. The inset shows the magnetic structure. Enlarge Image (14K) Fig. 3. Transverse Qx scans at the half-order position (Qz=0.314 Å−1) for [Co(6 nm)|Cu(6 nm)]20 in the as-prepared (shaded symbols) and saturated (H=400 Oe) states (open symbols). The (++) and (−−) NSF cross sections (circles and diamonds respectively) are shown in (a) and the (−+) and (+−) SF cross sections (squares and triangles) are shown in (b). Enlarge Image (7K) Fig. 4. Transverse Qx scans at the first-order position (Qz=0.575 Å−1) for [Co(6 nm)|Cu(6 nm)]20 in the as-prepared state (shaded symbols) relative to the saturated state (open symbols) in H=400 Oe. Only the NSF cross sections are shown. The 400 Oe (−−) data (circles) and (++) data (squares) are split because the Co moments are aligned parallel to the field. Insets (a) and (b) show multilayers with in-plane domains and magnetic roughness, respectively. References 1. M.N. Baibich, J.M. Broto, A. Fert, F. Nguyen Van Dau, F. Petroff, P. Etienne, G. Creuzet, A. Friederich and J. Chazelas. Phys. Rev. Lett. 61 (1988), p. 2472. 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Pietzak, H. Maletta and A. Weidinger. Physica B 221 (1996), p. 377. Abstract | PDF (327 K) 8. S.K. Sinha, E.B. Sirota, S. Garoff and H.B. Stanley. Phys. Rev. B 38 (1988), p. 2297. Abstract-INSPEC | $Order Document | Full Text via CrossRef 9. V. Holý and T. Baumbach. Phys. Rev. B 49 (1994), p. 10668. Abstract-INSPEC | $Order Document | Full Text via CrossRef 10. C.F. Majkrzak. Physica B 221 (1996), p. 342. Abstract | PDF (1061 K) 11. S.K. Sinha, in: D.A. Neumann, T.P. Russell, B.J. Wuensch (Eds.), Neutron Scattering in Materials Science II, Vol. 376, Mat. Res. Soc. Symp. Proc. Materials Research Society, Pittsburgh, 1995, p. 175.. 12. A. Schreyer, J.F. Ankner, Th. Zeidler, H. Zabel, C.F. Majkrzak, M. Schäfer and P. Grünberg. Europhys. Lett. 32 (1995), p. 595. Abstract-INSPEC | $Order Document 13. Ch. Rehm, D. Nagengast, F. Klose, H. Maletta and A. Weidinger. Europhys. Lett. 38 (1997), p. 61. Abstract-INSPEC | $Order Document | Full Text via CrossRef 14. C. Münster, T. Salditt, M. Vogel, R. Siebrecht and J. Peisl. Europhys. Lett. 46 (1999), p. 486. Abstract-INSPEC | $Order Document 15. G.P. Felcher. Physica B 192 (1993), p. 137. Abstract | Abstract + References | PDF (794 K) 16. M. Takeda, Y. Endoh, H. Yasuda, K. Yamada, A. Kamijo and J. Mizuki. J. Phys. Soc. Japan 62 (1993), p. 3015. Abstract-INSPEC | $Order Document 17. J.F. MacKay, C. Teichert, D.E. Savage and M.G. Lagally. Phys. Rev. Lett. 77 (1996), p. 3925. Abstract-INSPEC | $Order Document | APS full text | Full Text via CrossRef 18. Y.U. Idzerda, V. Chakarian and J.W. Freeland. Phys. Rev. Lett. 82 (1999), p. 1562. Abstract-INSPEC | $Order Document | APS full text | Full Text via CrossRef Corresponding Author Contact Information <#m4.bcor*> Corresponding author. Tel.: +1-301-97-56-597; email: julie.borchers@nist.gov This Document SummaryPlus Full Text + Links PDF (227 K) Actions Cited By Save as Citation Alert E-mail Article Export Citation Physica B: Condensed Matter Volume 283, Issues 1-3 , June 2000, Pages 162-166 Results List Previous 33 of 59 Next Home Search Browse Journals Browse Abstract Databases Browse Books Browse Reference Works My Profile Alerts Help (Opens New Window) Feedback | Terms & Conditions | Privacy Policy Copyright © 2004 Elsevier B.V. All rights reserved. ScienceDirect® is a registered trademark of Elsevier B.V.