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MA: Fachverband Magnetismus

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

MA 38.2: Vortrag

Mittwoch, 18. März 2020, 15:15–15:30, HSZ 401

Low-frequency magnetic resonances of the polar ferrimagnet Mn2Mo3O8 — •Dávid Szaller¹, Lukas Weymann¹, Alexey Shuvaev¹, Andrei Pimenov¹, Johan Viirok², Urmas Nagel², Toomas Room², Sándor Bordács³, Krisztián Szász³, Vladimir Tsurkan⁴, and István Kézsmárki⁴ — ¹Institute of Solis State Physics, TU Wien — ²National Institute of Chemical Physics and Biophysics, Tallinn — ³Department of Physics, Budapest University of Technology and Economics — ⁴Experimental Physics V, University of Augsburg

The polar M2Mo3O8 crystals with M=Fe,Co,Mn, exhibit various magnetic orders coupled to the electric polarization of the material. In the static limit, this magneto-electric coupling opens a new path for data storage[1], while in the dynamical range the spin-wave excitations offer a model system to study axion physics[2]. However, the microscopic description of the spin-wave resonances and the magneto-electric coupling in these material family is still an open task.

We followed the magnetic field dependence of the spin-wave resonances of the ferrimagnetic Mn2Mo3O8 in three magnetic phases by combining far-infrared optical spectroscopy and backward-wave oscillators. Both the observed resonance frequencies and the field dependence of the magnetization were quantitatively reproduced by a relative simple anisotropic two-sublattice antiferromagnetic model.

[1]Y. Wang et al, Sci. Rep. 5, 12268 (2015).

[2]T. Kurumaji et al, Phys. Rev. Lett. 119, 077206 (2017).