Aug 24, 2009 - multilayers (tTb and tFe are the Tb and Fe layer thicknesses respectively) with .... (ii) Fe spin reorientation transition and its dependence on the individual Fe ... in zero and non-zero external fields by comparing relative line ... nanocrystalline structure of Tb with a grain size too small to yield Bragg peaks in.
Philosophical Magazine Part B
ISSN: 1364-2812 (Print) 1463-6417 (Online) Journal homepage: http://www.tandfonline.com/loi/tphb20
Fe spin structure in Tb/Fe multilayers J. Tappert , S. Neumann , J. Jungermann , W. S. Kim , T. Ruckert , R. A. Brand , W. Keune , W. Kleemann , F. Richomme , J. Teillet , F. Klose & H. Maletta To cite this article: J. Tappert , S. Neumann , J. Jungermann , W. S. Kim , T. Ruckert , R. A. Brand , W. Keune , W. Kleemann , F. Richomme , J. Teillet , F. Klose & H. Maletta (2000) Fe spin structure in Tb/Fe multilayers, Philosophical Magazine Part B, 80:2, 257-274, DOI: 10.1080/13642810008208614 To link to this article: http://dx.doi.org/10.1080/13642810008208614
Published online: 24 Aug 2009.
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Date: 19 October 2015, At: 15:14
PHILOSOPHICAL MAGAZINE B, 2000, VOL. 80, No. 2, 257-274
Fe spin structure in Tb/Fe multilayers J.TAPPERT, S. NEUMANN, J. JUNGERMANN, W. S. KIM,T. RUCKERT, R. A. BRAND,W. KEUNE,W. KLEEMANN
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Laboratorium fiir Angewandte Physik, Gerhard-Mercator-Universitat Duisburg, D-47048 Duisburg, Germany
F. RICHOMME, J. TEILLET Groupe de Mttallurgie Physique, Universite de Rouen, F-76821 Mont-Saint-Aignan Cedex. France
F. KLosEt and H. MALETTA Hahn-Meitner Institut Berlin GmbH, D-14109 Berlin, Germany [Received 15 Marc11 1999 and accepted in revisedfovm 18 June 19991
ABSTRACT The Fe spin structure in ultrahigh-vacuum-deposited hcp Tb(lTb)/bccFe(fF,) multilayers (tTb and tFe are the T b and Fe layer thicknesses respectively) with perpendicular magnetic anisotropy (PMA) and large coercivity at low temperatures was investigated by 57Fe Mossbauer spectroscopy, the polar magneto-optical Kerr effect, and superconducting quantum interference device magnetometry. A spontaneous reversible temperature-driven Fe spin reorientation transition from orientation parallel to the film plane to an out-of plane orientation (with Fe spins tilted by an angle (0) relative to the film normal direction) was observed upon cooling below the reorientation temperature T R . At a fixed value of t T h , T R was found to follow a t F l behaviour, indicating that the PMA originates from the interfaces. Upon cooling, the perpendicular renianent magnetization shows a step-like increase near the magnetic ordering temperature of Tb. contrary to (Q)(T ) , which exhibits no such anomaly. Apparently, strong coupling of Fe layers via magnetic T b layers affects the perpendicular magnetic domain structure a t remanence. Further, 57Fe probe layer Mossbauer results concerning structure, composition and Fe spin orientation within Fe-on-Tb arid Tb-on-Fe interfaces are reported.
4 1. INTRODUCTION Nanoscale chemically modulated amorphous Tb/Fe and other RE/Fe multilayers (RE = rare earth) with rather thin individual layer thickness ( t ~tFe~
