Vol Page/Article: ------------------------------------------------------------------------ Article Collection: View Collection Help (Click on the COLLECT ARTICLE to add an article.) ------------------------------------------------------------------------ [ Previous / Next Abstract | Issue Table of Contents | Bottom of Page <#bottom> ] Physical Review B (Condensed Matter and Materials Physics) -- November 1, 2000 -- Volume 62, Issue 17, pp. 11340-11343 Full Text: [ PDF (60 kB) GZipped PS Order Document ] ------------------------------------------------------------------------ Determination of equilibrium coupling angles in magnetic multilayers by polarized neutron reflectometry C. H. Marrows,1 S. Langridge,2 and B. J. Hickey1 1Department of Physics and Astronomy, E.C. Stoner Laboratory, University of Leeds, Leeds LS2 9JT, United Kingdom 2ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom (Received 14 January 2000; revised 24 May 2000) We have performed polarized neutron reflectometry (PNR) on Co/Cu multilayers grown by sputter deposition at the first antiferromagnetic (AF) maximum of the coupling oscillation. The growth of the Cu spacer layers was paused halfway through each layer for a variable amount of time to allow residual gases to be adsorbed onto the surface. A sample with clean Cu spacers shows good AF coupling, with low remanence and high saturation field. The PNR spectra show a strong (1/2)-order Bragg peak and little splitting between the reflectivities for incident [up-arrow] and [down-arrow] spin neutrons at zero field, characteristic of AF ordering. Meanwhile, a more heavily gas-damaged sample with a remanent fraction of ~sqrt(2)/2 has strongly spin-split PNR spectra at the critical edge and nuclear Bragg peak, showing a significant ferromagnetic component. A strong (1/2)-order Bragg peak is still present. We are able to fit accurately the magnetization and PNR data by assuming that such a sample shows considerable biquadratic coupling, with moments coupled close to 90° at zero field. ©2000 The American Physical Society URL: http://link.aps.org/abstract/PRB/v62/p11340 doi: 10.1103/PhysRevB.62.11340 PACS: 75.70.Cn, 61.12.Ha, 75.25.+z Additional Information ------------------------------------------------------------------------ Full Text: [ PDF (60 kB) GZipped PS Order Document ] ------------------------------------------------------------------------ References Citation links [e.g., Phys. Rev. D 40, 2172 (1989)] go to online journal abstracts. Other links (see Reference Information ) are available with your current login. 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