Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Multiferroics and Magnetoelectric Coupling (joint session MA/FM)

MA 17.3: Vortrag

Dienstag, 10. März 2026, 10:00–10:15, POT/0112

Magnetoelectric coupling in antiferromagnetic BiCoO₃ — •Veronica Goian¹, Fedir Borodavka¹, Petr Proschek², Maxim Savinov¹, Christelle Kadlec¹, Hong Dong Nguyen¹, Andrei A. Belik³, and Stanislav Kamba¹ — ¹Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic — ²Department of Condensed Matter Physics, Charles University, Prague Czech Republic — ³National Institute for Materials Science: Tsukuba, Ibaraki, Japan

BiCoO₃ is a potential multiferroic material with a C-type antiferromagnetic phase transition at T_N=470 K and a hypothetical ferroelectric phase transition around 1000 K (the sample decomposes at around 470 ^∘C).[1] First-principles calculations predict an unusually strong antimagnetoelectric coupling in BiCoO₃.[2] However, no experimental measurements have been reported in the literature to determine the magnetoelectric coupling or related structural properties. This is mainly because BiCoO₃ requires high-pressure and high-temperature sintering. We have measured the dielectric permittivity, ferroelectric hysteresis loops, and Raman, THz, and IR spectra to probe the ferroelectric behavior. In addition, we found that BiCoO₃ exhibits well-measurable non-linear magnetoelectric coupling.

[1] Oka et al., J. Am. Chem. Soc., 132, 9438-9443 (2010)

[2] Braun et al., Phys. Rev. B, 110, 144442(2024)

Keywords: magnetoelectric coupling; antiferromagnetism; multiferroic; phonon; ferroelectricity