Magnetochiral nonreciprocity of volume spin wave propagation in chiral-lattice ferromagnets
Magnetochiral nonreciprocity of volume spin wave propagation in chiral-lattice ferromagnets
复制标题
手性晶格铁磁体中体积自旋波传播的磁手性非互易性
DOI：
10.1103/physrevb.93.235131
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Y. Tokura
中科院分区：
文献类型：
--
作者：
S. Seki;Y. Okamura;K. Kondou;K. Shibata;M. Kubota;R. Takagi;F. Kagawa;M. Kawasaki;G. Tatara;Y. Otani;and Y. Tokura
在具有手性晶体结构的磁性材料中，预测了平行和反平行于外加磁场的准粒子流可以表现出不同的传播特性，其非互易性的符号取决于底层大块晶格的手性。这种独特的现象，称为磁铁非互易性，以前已经在传播的光和传导电子中得到证实，但很少在其他准粒子中得到证实。在这项研究中，我们报道了用自旋波谱实验观测手征晶格铁磁体中传播磁子的磁化非互易性。我们发现，对于相反的手性晶体，非互易符号是相反的，并直接确定了与Dzyaloshinskii-Moriya(DM)相互作用相关的自旋波色散中的波数线性项是观察到的非互易的根源。我们的结果为基于体晶学对称性破缺的高效自旋波二极管的设计提供了一条途径，也为手性晶格化合物中DM相互作用的大小提供了一种独特的方法。
In magnetic materials with chiral crystal structure, it has been predicted that quasiparticle flows propagating parallel and antiparallel to the external magnetic field can show different propagating character, with its sign of nonreciprocity dependent on the chirality of the underlying bulk crystal lattice. This unique phenomenon, termedmagnetochiralnonreciprocity, has previously been demonstrated for the propagating light and conduction electrons but seldom for other quasiparticles. In this study, we report the experimental observation ofmagnetochiralnonreciprocity of propagating magnons for a chiral-lattice ferromagnetby employing the spin wave spectroscopy. We found that the sign of nonreciprocity is reversed for the opposite chirality of crystal, and also directly identified the wave-number-linear term in the spin wave dispersion associated with the Dzyaloshinskii-Moriya (DM) interaction as the origin of observed nonreciprocity. Our present results pave a route for the design of efficient spin wave diode based on the bulk crystallographic symmetry breaking and also offer a unique method to evaluate the magnitude of DM interaction in chiral-lattice bulk compounds.