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Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 4: Magnetic Coupling Phenomena; Exchange Bias

MA 4.2: Talk

Monday, February 25, 2008, 10:30–10:45, H 1028

Chemical Order-Induced Magnetic Exchange Bias — •Dieter Lott1, Frank Klose2,3, Hailemarian Ambaye3, Gary J. Mankey4, Prakash Mani4, Max Wolff5, Andreas Schreyer1, Hans M. Christen3, and B.C. Sales31GKSS Research Center, Max-Planck Str. 1, 21502 Geesthacht, Germany — 2ANSTO, Bragg Institute, Menai, NSW, 2234, Australia — 3Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA — 4MINT Center, University of Alabama, Tuscaloosa, AL, 35487, USA — 5Department of Physics, Ruhr-University Bochum, 44780 Bochum, Germany

We report on chemical order-induced magnetic exchange bias in FePt3, a material which - due to partial chemical disorder - has both ferromagnetic (FM) and antiferromagnetic (AFM) domains. Epitaxial thin films of this material were investigated by polarized neutron reflectivity and SQUID magnetometry in a superlattice system consisting of FePt3 and ferromagnetic CoPt3 layers. The onset of AFM order in the chemically ordered part of the FePt3 layers induces a strong exchange bias of the hysteresis loop. We demonstrate that the observed exchange bias originates intrinsically from within the FePt3 layer, i.e. we observe exchange bias between two different magnetic phases of a single crystal material having virtually the same chemical composition.

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