Nonreciprocal Magnons in Noncentrosymmetric Magnets

In a noncentrosymmetric crystalline material, the propagation of particles or quasiparticles can be nonreciprocal, i.e., the left-moving and right-moving (quasi)particles become inequivalent. In a noncentrosymmetric magnet, such nonreciprocity is expected for magnons, the quantized collective spin f...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2019-08, Vol.88 (8), p.81007
Main Authors: Sato, Taku J, Matan, Kittiwit
Format: Article
Language:English
Subjects:
Magnets
Magnons
Neutron scattering
Neutrons
Spin-orbit interactions
Spintronics
Variations
Wave propagation
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Summary:In a noncentrosymmetric crystalline material, the propagation of particles or quasiparticles can be nonreciprocal, i.e., the left-moving and right-moving (quasi)particles become inequivalent. In a noncentrosymmetric magnet, such nonreciprocity is expected for magnons, the quantized collective spin fluctuations that propagate as a wave in a magnetically ordered phase. Even though the nonreciprocal propagation of the magnons was theoretically proposed decades ago, experimentally, little attention has been given to the phenomenon, partly because of its putative subtleness originating from the weak relativistic spin–orbit coupling. The situation has markedly changed recently, as the possibility of measuring and controlling a magnon spin current in noncentrosymmetric magnets begins to gain wider recognition. In this article, we will review recent progress in the detection of the nonreciprocal magnons in noncentrosymmetric magnets. Particular emphasis will be placed on the neutron scattering studies where the magnon dispersion is directly measured in a microscopic length scale.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.88.081007