Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 29: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)

KFM 29.4: Vortrag

Donnerstag, 8. September 2022, 15:45–16:00, H47

Magnetization reversal through an antiferromagnetic state — •Somnath Ghara1, Evgenii Barts2, Kirill Vasin1, Dmytro Kamenskyi1, Lilian Prodan1, Vladimir Tsurkan1, Maxim Mostovoy2, Istvan Kezsmarki1, and Joachim Deisenhofer11Experimentalphysik V, University of Augsburg, Augsburg, Germany — 2University of Groningen, Groningen, The Netherlands

The polar magnet Fe2Mo3O8 has recently attracted tremendous interests due its versatile properties, such as magnetoelectric effect and giant thermal hall effect. This compound has a polar hexagonal (space group P63mc) structure at room temperature and undergoes a collinear antiferromagnetic ordering of Fe2+ moments below TN = 60 K, accompanied by a large electric polarization besides that of the structural origin. Upon application of (high) magnetic field, a metamagnetic transition from the antiferromagnetic to a ferrimagnetic state takes place. The ferrimagnetic state can also be stabilized by partially substituting Fe2+ ions by Zn2+ ions. The magnetic symmetry (6mm) of the ferrimagnetic state is compatible with a linear magnetoelectric effect. In this talk, I will show that at the coercive field of the isothermal reversal of a ferrimagnetic state in Fe1.86Zn0.14Mo3O8 the pristine antiferromagnetic state re-emerges as a metastable state. The reappearance of the antiferromagnetic state, supported by the theoretical calculations, is reflected in a large change of electric polarization and directly established by the reoccurrence of the characteristic low-energy THz excitation of the AFM state.

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