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O: Fachverband Oberflächenphysik

O 37: Poster Session III: Surface magnetism III

O 37.1: Poster

Tuesday, March 2, 2021, 10:30–12:30, P

Exchange bias in Co/CoO(110) bilayers — •Tomasz Blachowicz1 and Andrea Ehrmann21Silesian University of Technology, Institute of Physics - Centre for Science and Education, Gliwice, Poland — 2Bielefeld University of Applied Sciences, Faculty of Engineering and Mathematics, Bielefeld, Germany

Co/CoO is a ferromagnet/antiferromagnet system in which the exchange bias, a unidirectional anisotropy, was discovered [1]. The exchange bias can be accompanied by another anisotropy, the so-called 90° coupling, resulting in a rotation of hard and easy axes of the ferromagnet (FM) due to coupling to the antiferromagnet (AFM) at low temperatures [2]. Here we report on exchange bias and 90° coupling in Co/CoO(110) thin film systems, resulting not only in a rotation of the easy axes of the FM below the blocking temperature, but also in a significant increase of the coercive fields near the blocking temperature for one sample orientation. Combining Brillouin light scattering (BLS) and superconducting quantum interference device (SQUID) measurements, we show the temperature-dependent effect of the different superposed anisotropies.

[1] T. Blachowicz, A. Ehrmann: Exchange bias in thin films - an update, Coatings 11, 122 (2021)

[2] T. Błachowicz, A. Tillmanns, M. Fraune, B. Beschoten, and G. Güntherodt: Exchange-bias in (110)-oriented CoO/Co bilayers with different magnetocrystalline anisotropies, Phys. Rev. B 75, 054425 (2007)

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