Electric polarization memory effect in a magnetoelectric multiferroic CuFe_1−x

详细信息    查看全文

• 作者：Setsuo Mitsuda ; Taro Nakajima ; Motoyoshi Yamano ; Keiichirou Takahashi ; Hiroe Yamazaki ; Kazuya Masuda ; Yoshiaki Kaneko ; Noriki Terada ; Karel Prokes ; Klaus Kiefer
• 关键词：Magnetoelectric multiferroic ; CuFeO₂ ; Spin frustration ; Polarized neutron ; Electric polarization ; Memory effect
• 刊名：Physica B
• 出版年：2009
• 出版时间：1 September 2009
• 年：2009
• 卷：404
• 期：17
• 页码：2532-2534
• 全文大小：407 K

文摘

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 CuFe_1−xGa_xO₂ sample with x=0.035, in which the single ferroelectric phase is realized below T_N8 K in zero magnetic field unlike CuFe_1−xAl_xO₂, 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 T_N 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.