Magnetic resonances of multiferroic TbFe3(BO3)4

Szaller, Dávid and Kocsis, Vilmos and Bordács, Sándor and Fehér, Titusz and Rõõm, Toomas and Nagel, Urmas and Engelkamp, Hans and Ohgushi, Kenya and Kézsmárki, István (2017) Magnetic resonances of multiferroic TbFe3(BO3)4. PHYSICAL REVIEW B CONDENSED MATTER AND MATERIALS PHYSICS. pp. 1-7. ISSN 1098-0121

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Abstract

Low-energy magnetic excitations of the easy-axis antiferromagnet TbFe3(BO3)4 are investigated by far-infrared absorption and reflection spectroscopy in high magnetic fields up to 30 T. The observed field dependence of the resonance frequencies and the magnetization are reproduced by a mean-field spin model for magnetic fields applied both along and perpendicular to the easy axis. Based on this model we determined the full set of magnetic interactions, including Fe-Fe and Fe-Tb exchange interactions, single-ion anisotropy for Tb ions and g factors, which describe the ground-state spin texture and the low-energy spin excitations of TbFe3(BO3)4. Compared to earlier studies, we allow a small canting of the nearly Ising-type Tb moments to achieve a quantitative agreement with the magnetic susceptibility measurements. The additional high-energy magnetic resonance lines observed, besides the two resonances expected for a two-sublattice antiferromagnet, suggest a more complex six-sublattice magnetic ground state for TbFe3(BO3)4.

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