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MA: Fachverband Magnetismus

MA 38: Multiferroics and Magnetoelectric Coupling II (joint session MA/KFM)

MA 38.5: Vortrag

Mittwoch, 18. März 2020, 16:00–16:15, HSZ 401

In-situ switching of the magnetoelectric domain states in the cubic spinel Co3O4 — •Maximilian Winkler, Somnath Ghara, Korbinian Geirhos, Peter Lunkenheimer, Stephan Krohns, Vladimir Tsurkan, and István Kézsmárki — Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg, Germany

We report a strong linear magnetoelectric effect in the collinear antiferromagnetic state of Co3O4 single crystals. Co3O4 crystallizes in the cubic spinel structure, with magnetic Co²⁺ at the A-sites, tetrahedrally surrounded by oxygen, and non-magnetic Co³⁺ at the B-sites in an octahedral environment [1]. In this work, we investigate all components of the magnetoelectric tensor and found that the largest value of is α = 14 ps/m. We showed that the magnetoelectric mono-domain state can be obtained by magnetoelectric poling across the Néel-temperature, TN = 30 K. For the mono-domain state the sign of α depends on the sign of the product of the external electric and magnetic fields, E and H. We also demonstrated, that after the magnetoelectric poling below TN the magnetoelectric domain state can be controlled in-situ by reversing either the external electric or magnetic field. The dynamics of this switching process leads to a deeper understanding of the linear magnetoelectric coupling in Co3O4.
[1] W. Roth, J. Phys. Chem. Solids 25, 1-10 (1964)