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MA: Fachverband Magnetismus

MA 18: Multiferroics and magnetoelectrics I (joint session MA/KFM)

MA 18.4: Vortrag

Dienstag, 13. März 2018, 10:15–10:30, EB 202

Low energy spin excitations in multiferroic Mn₂Mo₃O₈ — •Krisztián Szász¹, Dávid Szaller², Sándor Bordács¹, Laur Peedu³, Johan Viirok³, Toomas Rõõm³, Urmas Nagel³, Vladimir Tsurkan⁴, and István Kézsmárki^1,4 — ¹Budapest University of Technology and Economics, Budapest, Hungary — ²Vienna University of Technology, Vienna, Austria — ³National Institute of Chemical Physics and Biophysics, Tallinn, Estonia — ⁴University of Augsburg, Augsburg, Germany

Recently, it was found that the polar ferrimagnet Mn₂Mo₃O₈ shows large diagonal magnetoelectric effect [1]. However, the magnetic structure of this compound is not fully understood. The family of polar ferrimagnets M₂Mo₃O₈ with M = Mn, Fe, Co or Ni are excellent materials to investigate the role of different magnetic ions in the microscopic origin of magnetoelectric effect.

In this work magnetization measurements and high magnetic field far infrared spectroscopy are used to unreveal the spin excitations in the low-field ferrimagnetic and in the spin-flop phases. From the magnetic field dependence of the magnon excitation energies we aim to determine the most important exchange and anisotropy parameters. With these parameters it is possible to construct a microscopic spin model of this compound.

[1] T. Kurumaji et al.: PRB 95, 045142 (2017).