Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 14: Electronic Structure of Magnetism, Computational Magnetism

MA 14.8: Talk

Tuesday, March 17, 2015, 11:30–11:45, H 0112

Effective models for exchange bias systems based on atomistic spin dynamics simulations — •Irina Stockem, Stefan Muschack, and Christian Schröder — Bielefeld Institute for Applied Materials Research, University of Applied Sciences Bielefeld, Wilhelm-Bertelsmann-Str. 10, 33602 Bielefeld, Germany

The exchange bias anisotropy was observed at stacked ferromagnetic and antiferromagnetic layers by Meiklejohn and Bean in the 1950^th [1]. The exchange bias leads to an asymmetric shift of the hysteresis loop, which is fixed during the fabrication process in conventional systems. In novel systems, like Co/Cr₂O₃, this shift can be switched [2]. Although the discovery of the exchange bias is more than half a century ago a comprehensive theoretical model is still missing. Many simplified and analytical solvable models exist but these are not applicable to real exchange biased structures. In order to obtain a better understanding of the dominating factors of exchange bias systems we have developed effective models and investigated these by spin dynamics simulations [3]. We compare our results to existing models and to atomistic spin dynamics simulations of a three dimensional Co/Cr₂O₃ model system.

W. H. Meiklejohn and C. P. Bean, Phys. Rev. 105, 904 (1957).
Y. Shiratsuchi et al., Appl. Phys. Lett. 100, 262413 (2012).
L. Engelhardt and C. Schröder, in Molecular Cluster Magnets, World Scientific Publishers, Singapore (2011).