Electric polarization memory effect in a magnetoelectric multiferroic CuFe1−xGaxO2 |
| |
| Authors: | Setsuo Mitsuda Taro Nakajima Motoyoshi Yamano Keiichirou Takahashi Hiroe Yamazaki Kazuya Masuda Yoshiaki Kaneko Noriki Terada Karel Prokes Klaus Kiefer |
| |
| Institution: | aDepartment of Physics, Faculty of Science, Tokyo University of Science, Tokyo 162-8601, Japan;bICYS, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;cHelmholtz Centre Berlin for Materials and Energy, SF-2, Glienicker Str. 100, 14109 Berlin, Germany |
| |
| Abstract: | Magnetic oxide CuFeO2 is a magnetoelectric multiferroic with new type of spin–polarization coupling different from that in the spin-current mechanism, where magnetic field-induced or nonmagnetic impurity-induced proper helical magnetic ordering generates a spontaneous electric polarization parallel to the helical axis. Using a CuFe1−xGaxO2 sample with x=0.035, in which the single ferroelectric phase is realized below TN 8 K in zero magnetic field unlike CuFe1−xAlxO2, we have performed pyroelectric current, thermally stimulated current (TSC) and polarized neutron diffraction measurements to study a memory effect that the electric polarization is partially preserved even for 2nd-cooling from above TN without poling electric field. It was found that the charge trapped during 1st-cooling with poling electric field, which is released as TSC on heating, plays an important role in the memory effect. |
| |
| Keywords: | Magnetoelectric multiferroic CuFeO2 Spin frustration Polarized neutron Electric polarization Memory effect |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
