Unusual magnetoelectric memory and polarization reversal in the kagome staircase compound Ni3V2O8
Unusual magnetoelectric memory and polarization reversal in the kagome staircase compound Ni3V2O8
复制标题
Kagome 阶梯化合物 Ni3V2O8 中不寻常的磁电记忆和极化反转
DOI：
10.1103/physrevb.97.174429
复制
发表时间：
2018
影响因子：
3.7
通讯作者：
Tokunaga M.
中科院分区：
文献类型：
--
作者：
Liu Y. J.;Wang J. F.;He Z. Z.;Lu C. L.;Xia Z. C.;Ouyang Z. W.;Liu C. B.;Chen R.;Matsuo A.;Kohama Y.;Kindo K.;Tokunaga M.
We study the electric polarization of the kagome staircasein magnetic fields up to 30 T and report a magnetoelectric memory effect controlled by bias electric fields. The explored ferroelectric phase inis electrically controlled, whereas the ferroelectric phase inexhibits unusual memory effects. We determine a characteristic critical magnetic field H3=11T, below which strong memory exists and the polarization is frozen even in opposite bias fields. But when magnetic fields exceed H3, the frozen polarization is released and polarization reversal appears by tuning bias electric fields. We ascribe these phenomena to the pinning-depinning mechanism: nucleation and the accompanying pinning of chiral domain walls cooperatively induce the frozen behavior; the polarization reversal results from the depinning through the ferroelectrtic-to-paraelectric phase transition in high magnetic fields. Our experimental results reveal that the first-order phase transition plays an important role in these unusual memory effects.
