Multiferroics with Spiral Spin Orders
Multiferroics with Spiral Spin Orders
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DOI：
10.1002/adma.200901961
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发表时间：
2010-04-12
影响因子：
29.4
通讯作者：
Seki, Shinichiro
中科院分区：
文献类型：
--
作者：
Tokura, Yoshinori;Seki, Shinichiro
固体中的磁和电之间的相互关联可以产生磁电效应，例如磁感应极化(磁化)。要获得巨大的磁电响应，关键是找到有效的磁电耦合机制。其中，最近在自旋交换和自旋轨道相互作用的作用下，在绝缘层中出现的自发(铁电)极化现象被揭开。极化的符号取决于螺旋度(自旋旋转感)，而极化方向本身取决于机制的进一步细节和潜在的晶格对称性。在这里，我们描述了一些典型的螺旋-自旋多铁体，它们实现了一些非传统的磁电控制，如磁场诱导的极化方向和极化幅度的变化，以及电场诱导的自旋螺旋度和磁畴的变化。
Cross correlation between magnetism and electricity in a solid can host magnetoelectric effects, such as magnetic (electric) induction of polarization (magnetization). A key to attain the gigantic magnetoelectric response is to find the efficient magnetism electricity coupling mechanisms. Among those, recently the emergence of spontaneous (ferroelectric) polarization in the insulating helimagnet or spiral-spin structure was unraveled, as mediated by the spin-exchange and spin orbit interactions. The sign of the polarization depends on the helicity (spin rotation sense), while the polarization direction itself depends on further details of the mechanism and the underlying lattice symmetry. Here, we describe some prototypical examples of the spiral-spin multiferroics, which enable some unconventional magnetoelectric control such as the magnetic-field-induced change of the polarization direction and magnitude as well as the electric-field-induced change of the spin helicity and magnetic domain.