SKM 2023 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.28: Poster

Thursday, March 30, 2023, 14:00–16:00, P2/EG

Micromagnetic simulation of magnetic reversal processes in exchange biased thin film geometries — •Lukas Paetzold, Sapida Akhundzada, Christian Janzen, and Arno Ehresmann — Institute of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany

As first observed by Meiklejohn and Bean [1] and described as a unidirectional anisotropy, the exchange bias is a well-known interface effect between antiferromagnetic and ferromagnetic thin films. Initiated by field cooling [1], sputter deposition [2], or light-ion bombardment [3] the effect appears as a shift of the hysteresis loop and increased coercive fields [4]. Micromagnetic simulations [5,6] are presented for investigating the magnetic reversal processes in exchange biased thin film systems with a polycrystalline uncompensated antiferromagnetic layer. Different geometries like stripes, squares and discs in the micrometer range are simulated and the influence of modified magnetic parameters in the edges is investigated.

[1] W. H. Meiklejohn et al., Phys. Rev. 105, 904 (1956)

[2] A. E. Berkowitz et al., J. Magn. Magn. Mater. 200, 552-570 (1999)

[3] D. Engel et al., J. Magn. Magn. Mater. 293, 849-853 (2005)

[4] J. Nogués et al., J. Magn. Magn. Mater. 192(2), 203-232 (1999)

[5] A. Vansteenkiste et al., AIP Advances 4, 107133 (2014)

[6] J. De Clercq et al., J. Phys. D: Appl. Phys. 49, 435001 (2016)