Regensburg 2010 – wissenschaftliches Programm
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KR: Fachverband Kristallographie
KR 10: Poster: Multiferroics (with MA, DF, KR, DS)
KR 10.29: Poster
Dienstag, 23. März 2010, 10:45–13:45, Poster A
Exchange Bias and Training Effect in Ni/FexMn1−x/Ni Trilayers — •Paul Stoll, Miriam Stampe, and Wolfgang Kuch — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
We have investigated ultrathin single-crystalline Ni/FexMn1−x/Ni/Cu(001) trilayers with out-of-plane magnetization. These trilayers show exchange bias due to the interface coupling between the ferromagnetic (FM) Ni and the antiferromagnetic (AFM) FeMn layers as well as ferromagnetic interlayer coupling between the two FM layers. Hysteresis loops for samples with different FM and AFM layer thickness and FeMn composition have been measured at different temperatures and for opposite cooling fields using polar magneto-optical Kerr effect (MOKE). The hysteresis curves show a two-step magnetization reversal with the coercivities clearly attributed to the switching fields of the two FM layers. In the minor loops unidirectional anisotropy as well as a training effect have been observed.
Financial support by the DFG (KU1115/9-1) is acknowledged.