Go to ScienceDirect® Home Skip Main Navigation Links Register or Login: Password: Home Search Browse Journals Browse Book Series and Reference Works Browse Abstract Databases 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 103 of 168 Next Journal of Magnetism and Magnetic Materials Volumes 258-259 , March 2003, Pages 382-387 Second Moscow International Symposium on Magnetism This Document SummaryPlus Full Text + Links PDF (899 K) Actions Cited By Save as Citation Alert E-mail Article Export Citation doi:10.1016/S0304-8853(02)01118-6 How to Cite or Link Using DOI (Opens New Window) Copyright © 2002 Elsevier Science B.V. All rights reserved. Ordering in magnetic multilayers by off-specular neutron scattering V. Lauter-PasyukCorresponding Author Contact Information <#m4.cor*>, E-mail The Corresponding Author , a <#affa>, b <#affb>, H. J. Lauterc <#affc>, B. Topervergd <#affd>, e <#affe>, L. Romashevf <#afff>, M. Milyaevf <#afff>, A. Petrenkob <#affb>, V. Aksenovb <#affb> and V. Ustinovf <#afff> a Physik Department, TU.München, D-85747, Garching, Germany b Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia c Institute Laue Langevin, B.P. 156,F-38042, Grenoble Cedex 9, France d Forschungszentrum Jülich, IFF, D-52425, Jülich, Germany e Petersburg Nuclear Physics Institute, Gatchina, 188350, St. Petersburg, Russia f Institute of Metal Physics, Ural Div. Russian Academy Sciences, GSP-170 18 S. Kovalevskaya Str., 62019, Ekaterinburg, Russia Available online 1 October 2002. Abstract The combination of specular reflection and off-specular scattering with polarized neutrons gives a unique detailed information on the lateral and transverse spin-configuration of a magnetic multilayer stack. We present the first direct experimental observation of a phenomenon predicted theoretically for antiferromagnetically coupled multilayers: the twisted ground-state configuration in an external magnetic field. This twisted configuration arises due to the reduced symmetry of magnetic moments of the end layers having only one neighbor. This fact can be established directly via the qualitative analysis of the line shape of the superstructure peaks on the specular line and the related off-specular Bragg sheet. Additional quantitative evaluation of both specular reflection and off-specular scattering allows one to deduce the layer-by-layer spin configuration through the multilayer stack, as well as within the plane of the layer. The presence of spin-flip off-specular scattering means that the layer magnetization is laterally not homogeneous but is decomposed into a set of domains. The distribution of magnetic moments within each domain, the domains size and their distributions are obtained. Author Keywords: Neutron reflection—polarized; Thin film—multilayers; Exchange coupling—non-collinear Article Outline 1. Introduction 2. Experiment 3. Data analysis and discussion 4. Conclusions Acknowledgements References Enlarge Image (8K) Fig. 1. Schematic presentation of an exchange coupled multilayer stack in an external in-plane magnetic field H and the scattering geometry of the neutron experiment. The polarized neutron beam with the incident angle small alpha, Greeki scatters from the sample in specular and off-specular directions with outgoing angles small alpha, Greekf. pi and pf are the perpendicular to the surface projections of incoming and scattered neutron wave-vectors, respectively. Enlarge Image (50K) Fig. 2. (a) Experimental 2D map of the intensity scattered from sample 1 in an external magnetic field of H=400 G as a function of (pi+pf) and (pi–pf), with pi and pf the perpendicular projections of incoming and scattered neutron wave-vectors, respectively. The logarithmic intensity gray-color scale is shown on the side. The incoming neutrons are in the "-" state (neutron spin is antiparallel to the direction of the external field). (b) 2D-model fit to the experimental data in Fig. 1a <#fig1>. (c) Experimental 2D intensity map with the analysed region between the dashed lines for the "–" state (non-spin-flip intensity). Enlarge Image (13K) Fig. 3. Examples of magnetization configurations in a finite multilayer composed of an even number of ferromagnetic (FM) layers l antiferromagnetically coupled across non-magnetic spacers (only FM layers are shown); three possible types of domains are depicted: (a) interlayer coupling is antiferromagnetic, external magnetic field H=0; (b) non-collinear configuration, canting angles curly or open small phi, Greekl=−curly or open small phi, Greekl, H=0; c) twisted non-collinear configuration in an external magnetic field applied along the in-plane easy axis, curly or open small phi, Greekl=−curly or open small phi, Greekl and curly or open small phi, Greekl>−curly or open small phi, Greek l−1. Brackets A and B indicate the two transverse anti-phase parts of one lateral domain. Enlarge Image (7K) Fig. 4. Twisted canting angle curly or open small phi, Greekl as a function of Fe layer l for sample 1 in the external magnetic field H of 200 G (black dots) and 400 G (open circles). Enlarge Image (22K) Fig. 5. Experimental 2D scattered intensity map from sample 2 in the in-plane external magnetic field of 300 G as a function of (pi+pf) and (pi–pf), with pi and pf the perpendiculars to the surface projections of incoming and scattered neutron wave-vectors, respectively. The logarithmic intensity gray-color scale is shown on the side. The incoming neutrons are in the "-" state. 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. Abstract-INSPEC | $Order Document | Full Text via CrossRef 2. G. Binasch, P. Grünberg, F. Saurenbach and W. Zinn. Phys. Rev. B 39 (1989), p. 4828. Abstract-INSPEC | $Order Document | Full Text via CrossRef 3. B. Heinrich, J.A.C. Bland (Eds.), Ultrathin Magnetic Structures II, Springer, Berlin, 1994, p. 45 (Chapter 2). 4. Y. Yafet. In: L.H. Bennet and R.E. 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Fax: +33-4-76-20-71-20 This Document SummaryPlus Full Text + Links PDF (899 K) Actions Cited By Save as Citation Alert E-mail Article Export Citation Journal of Magnetism and Magnetic Materials Volumes 258-259 , March 2003, Pages 382-387 Second Moscow International Symposium on Magnetism Results List Previous 103 of 168 Next Home Search Browse Journals Browse Book Series and Reference Works Browse Abstract Databases My Profile Alerts Help (Opens New Window) Feedback | Terms & Conditions | Privacy Policy Copyright © 2005 Elsevier B.V. All rights reserved. ScienceDirect® is a registered trademark of Elsevier B.V.