Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 8: Multiferroics and magnetoelectrics I (joint session MA/KFM)
KFM 8.4: 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 Kézsmárki1,4 — 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).