In TbFeO3 orthoferrite at temperatures below the antiferromagnetic ordering temperature for the terbium subsystem (∼3.2 K), the electric polarization Pa(Hb) induced by a magnetic field Hb along the a axis is found. Such polarization is accompanied by anomalies related to metamagnetic (for Tb) and spin-reorientation (for Fe) transitions. At low magnetic fields |H| < Hcr1 ∼ 5 kOe, the Pa(Hb) dependence exhibits a strong hysteresis and has a “butterfly” shape, while in intermediate-field magnetic configurations, |Hcr1| < |H| < |Hcr2| ~ 18 kOe, the sign of the polarization is determined by the sign of an applied electric field, and the Pa(Hb) dependence turns out to be nonmonotonic. A qualitative explanation of the observed effects is given in the framework of a symmetry analysis of the allowed magnetoelectric interactions in the field-induced magnetic structures.
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This work was supported by the Russian Science Foundation (project no. 22-12-00375).
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Ivanov, V.Y., Kuz’menko, A.M., Tikhanovskii, A.Y. et al. Observation of Magnetic-Field-Induced Electric Polarization in Terbium Orthoferrite. Jetp Lett. 117, 38–43 (2023). https://doi.org/10.1134/S0021364022602809
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DOI: https://doi.org/10.1134/S0021364022602809