Isotropic exchange-bias in twinned epitaxial Co/Co3O4 bilayer

Author:

Wortmann Martin1ORCID,Samanta Tapas1ORCID,Gaerner Maik1ORCID,Westphal Michael1,Fiedler Johannes2,Ennen Inga1,Hütten Andreas1ORCID,Blachowicz Tomasz3ORCID,Caron Luana14,Ehrmann Andrea2ORCID

Affiliation:

1. Bielefeld University, Faculty of Physics, Universitätsstraße 25 1 , 33615 Bielefeld, Germany

2. Bielefeld University of Applied Sciences and Arts, Faculty of Engineering and Mathematics 2 , Interaktion 1, 33619 Bielefeld, Germany

3. Silesian University of Technology, Institute of Physics—Center for Science and Education 3 , 44-100 Gliwice, Poland

4. Helmholtz-Zentrum Berlin für Materialien und Energie 4 , Berlin 12489, Germany

Abstract

Exchange bias (EB) is a unidirectional anisotropy caused by interface coupling between a ferromagnet and an antiferromagnet. It causes a preferential direction of magnetization in the ferromagnet, which manifests as a shift of the hysteresis loop along the magnetic field axis. Here, we demonstrate a large EB of over 1000 Oe at 20 K in a twinned Co(111)/Co3O4(111) thin film epitaxially grown on sapphire(0001) with sixfold rotational lattice symmetry, which is among the highest values reported for Co/Co1−yO systems. In such systems, the effect intensity is largest along the magnetic easy axes, which usually results in an anisotropy of the EB in epitaxial interfaces. However, we observed identical EB values for 0°, 15°, and 30° angles between the magnetic field and the nearest Co[002] magnetic easy axes. The measurements imply a relaxation of the magnetization to the nearest easy axis, suggesting increasingly isotropic EB fields with higher orders of rotational lattice symmetry.

Funder

Deutsche Forschungsgemeinschaft

Universitätsbibliothek Bielefeld

Publisher

AIP Publishing

Subject

General Engineering,General Materials Science

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