Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 24: Terahertz Spintronics I
MA 24.4: Vortrag
Mittwoch, 20. März 2024, 10:15–10:30, EB 202
THz excitations in Fe2Mo3O8 and how they track a highly unusual magnetization reversal — •Joachim Deisenhofer1, Somnath Ghara1, Vladimir Tsurkan1, Lilian Prodan1, Maxim Mostovoy2, Evgenii Barts2, Kirill Vasin1,3, Mikhail V. Eremin3, Istvan Kezsmarki1, Felix Schilberth1, Dmytro Kamenskyi1, and Alexey R. Nurmukhametov3 — 1Experimental Physics V, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, D-86135 Augsburg, Germany — 2Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands. — 3Kazan, Russia.
We investigated the THz excitations in the polar honeycomb antiferromagnet Fe2Mo3O8 in external magnetic fields and their optical toroidal effect, together with the temperature dependencee of the electronic transitions in the mid- and near-infrared frequency range. Using an advanced single-ion approach for the Fe ions, we are able to describe the optical excitation spectrum from the THz to the near-infrared regime and model the toroidal optical effect successfully. Moreover, we show that the lowest-lying optical mode tracks an unusual magnetization reversal in lightly Zn-doped Fe2Mo3O8: The magnetization reversal of the field-induced ferrimagnetic state at the coercive field occurs via the antiferromagnetic state, i.e. a magnetization compensation on the atomic level instead of the usual compensation by macroscopic domains.
Keywords: polar honeycomp antiferromagnet; toroidal magnetoelectric effect; magnetization reversal; THz excitations