Magnetic-field-induced ferroelectric polarization flop under pressure in TbMnO3

International Conference on Strongly Correlated Electron Systems 2014

Aoyama, Takuya^1 ; Iyama, Ayato^1 ; Shimizu, Katsuya^1 ; Kimura, Tsuyoshi^1

Division of Materials Physics, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka

560-8531, Japan^1

关键词: Applied pressure;    Ferroelectric polarization;    Magnetic field profile;    Magnetoelectric properties;    Multiferroics;    Spin order;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012118/pdf
DOI  :  10.1088/1742-6596/592/1/012118

来源: IOP

【 摘 要 】

Magnetoelectric properties of multiferroic TbMnO3with a cycloidal spiral spin order were investigated as functions of applied pressure and magnetic field. We found that a flop of ferroelectric polarization occurs by applying a magnetic field along the a axis under 2-3 GPa below the Néel temperature of Tb moments. A possible origin of the magnetoelectric transition is discussed based on the observed pressure and magnetic-field profiles of the ferroelectric polarization and the dielectric relaxation. This flop would originate from the 90° rotation of the cycloidal spiral plane from the bc plane to the ab plane.