Magnetic-field-induced ferroelectric state in DyFeO3
Magnetic-field-induced ferroelectric state in DyFeO3
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DOI：
10.1103/physrevlett.101.097205
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发表时间：
2008-08-29
影响因子：
8.6
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Tokunaga, Y.;Iguchi, S.;Tokura, Y.
在单晶DyFeO3中发现了多种多样的、巨大的磁网电现象。在Dy矩的反铁磁有序温度以下，观察到一个类似于2.4 X 10(-2) esu的线性- me张量分量，其大小为α (zz)。在c轴方向上施加磁场，在c轴方向上产生磁化强度[>= 0.5 μ c /cm(2)]和电极化（>= 0.2 μ c /cm(2)）的多铁性（弱铁磁性和铁电性）相。在相邻的Fe3+和Dy3+层以及各自的层状反铁磁组分之间工作的交换伸缩被认为是多铁相中铁电极化的起源。
Versatile and gigantic rnagnetoelectric (ME) phenomena have been found for a single crystal of DyFeO3. Below the antiferromagnetic ordering temperature of Dy moments, a linear-ME tensor component as large as alpha(zz) similar to 2.4 X 10(-2) esu is observed. It is also revealed that application of magnetic field along the c axis induces a multiferroic (weakly ferromagnetic and ferroelectric) phase with magnetization [>= 0.5 mu(B)/formula unit (f.u,)] and electric polarization (>= 0.2 mu C/cm(2)) both along the c axis. Exchange striction working between adjacent Fe3+ and Dy3+ layers with the respective layered antiferromagnetic components is proposed as the origin of the ferroelectric polarization in the multiferroic phase.