Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 32: Multiferroics and Magnetoelectric Coupling I (joint session MA/KFM)
MA 32.1: Talk
Wednesday, March 18, 2020, 09:30–09:45, HSZ 401
High Temperature THz study of conical phase of BiFeO3 — •Dániel Gergely Farkas1, 2, Boglárka Tóth1, Kirill Amelin3, Toomas Rõõm3, Urmas Nagel3, Toshimitsu Ito4, and Sándor Bordács1 — 1Department of Physics, Budapest University of Technology and Economics — 2Condensed Matter Research Group of the Hungarian Academy of Sciences, 1111 Budapest, Hungary — 3National Institute of Chemical Physics and Biophysics, Tallinn, Estonia — 4National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
Multiferroics, materials with coexisting ferroelectric and magnetic order, are one of the most intensively studied systems in modern solid-state physics. BiFeO3 is one of the most studied multiferroic material since its multiferroic phase persists also at room temperature [1].
A recent theoretical model [2] predicted a conical phase between the cycloidal and canted AFM phase in BiFeO3. Magnetization measurements up to 300K have already confirmed the existence of this intermediate phase [3].
We performed THz absorption measurements at temperatures between 5-350K, and observed the magnon spectrum of the conical phase. The phase transitions and their hysteresis were observed at 300 and 350K.
[1] J. Moreau, et al., J. Phys. Chem. Solids 32, 1315 (1971).
[2] Z. V. Greeva, et al., Phys. Rev. B 87, 214413 (2013).
[3] S. Kawachi, et al., Phys. Rev. Mat. 1, 024408 (2017).