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MA: Fachverband Magnetismus

MA 26: Thin films – coupling effects

MA 26.3: Talk

Wednesday, March 14, 2018, 10:00–10:15, EB 301

Cooling field and sample orientation dependent magnetization reversal processes in exchange biased Co/CoO on MgO(100) — •Andrea Ehrmann¹ and Tomasz Blachowicz² — ¹Bielefeld University of Applied Sciences, Faculty of Engineering and Mathematics, 33619 Bielefeld, Germany — ²Silesian University of Technology, Institute of Physics - Center for Science and Education, 44-100 Gliwice, Poland

Co/CoO is a typical exchange bias (EB) system which was investigated for long time, either as core/shell particles, as thin film systems or in other shapes. While other systems seem to be of higher interest in basic and applied research, a surprising effect could be found in Co/CoO thin film systems epitaxially grown on MgO(100) substrates: Such samples show a strong influence of the orientation of the average uncompensated antiferromagnetic magnetization with respect to the cooling field direction, resulting in unexpected asymmetric behavior during sample rotations. The horizontal loop shift as well as the sign of the transverse magnetization peaks in magneto-optical Kerr effect (MOKE) experiments change their values depending on the rotational direction. Here we will give a broad overview of the impact of cooling field and sample orientation on the magnetization reversal processes in this system.

[1] A. Ehrmann, T. Blachowicz: Angle and rotational direction dependent horizontal loop shift in epitaxial Co/CoO bilayers on MgO(100), AIP Advances 7, 115223 (2017)