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Magnetochiral nonreciprocity of volume spin wave propagation in chiral-lattice ferromagnets

机译：体自旋波在铁磁晶格铁磁体中的磁自旋不互易性

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摘要

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, termed magnetochiral nonreciprocity, has previously been demonstrated for the propagating light and conduction electrons but seldom for other quasiparticles. In this study, we report the experimental observation of magnetochiral nonreciprocity of propagating magnons for a chiral-lattice ferromagnet Cu_2OSeO_3 by 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.
机译：在具有手性晶体结构的磁性材料中，据预测，与外部磁场平行和反平行传播的准粒子流可以显示不同的传播特性，其不可逆性的迹象取决于下面的体晶格的手性。这种独特的现象被称为磁吸性不可逆性，先前已在传播的光和传导电子中得到证明，而在其他准粒子中却很少见。在这项研究中，我们报告了利用自旋波谱学对手性晶格铁磁体Cu_2OSeO_3传播的磁振子的磁涡旋不可逆性的实验观察。我们发现，对于晶体的相反手性，不可逆性的符号是相反的，并且还直接将与Dzyaloshinskii-Moriya（DM）相互作用相关的自旋波色散中的波数线性项确定为观察到的不可逆性的起源。我们目前的研究结果为基于体晶体对称性破坏的高效自旋波二极管的设计铺平了道路，并且还提供了一种独特的方法来评估手性-晶格体化合物中DM相互作用的幅度。

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  • 来源
    《Physical review》 |2016年第23期|235131.1-235131.9|共9页
  • 作者

    S. Seki; Y. Okamura; K. Kondou; K. Shibata; M. Kubota; R. Takagi; F. Kagawa; M. Kawasaki; G. Tatara; Y. Otani; Y. Tokura;

  • 作者单位

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan,PRESTO, Japan Science and Technology Agency (JST), Tokyo 113-8656, Japan;

    Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan,Research and Development Headquarters, ROHM Co., Ltd., Kyoto 615-8585, Japan,Technology and Business Development Unit, Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto 617-8555, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan,Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan,Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan,Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan;

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