Theory of chiral effects in magnetic textures with spin-orbit coupling

C. A. Akosa, A. Takeuchi, Z. Yuan, G. Tatara

研究成果査読

4 被引用数 (Scopus)

抄録

We present a theoretical study of two-dimensional spatially and temporally varying magnetic textures in the presence of spin-orbit coupling (SOC) of both the Rashba and Dresselhaus types. We show that the effective gauge field due to these SOCs, contributes to the dissipative and reactive spin torques in exactly the same way as in electromagnetism. Our calculations reveal that Rashba (Dresselhaus) SOC induces a chiral dissipation in interfacial (bulk) inversion asymmetric magnetic materials. Furthermore, we show that in addition to chiral dissipation αc, these SOCs also produce a chiral renormalization of the gyromagnetic ratio γ c, and show that the latter is intrinsically linked to the former via a simple relation αc=(τ/τex)γ c, where τex and τ are the exchange time and the electron relaxation time, respectively. Finally, we propose a theoretical scheme based on the Scattering theory to calculate and investigate the properties of damping in chiral magnets. Our findings should in principle provide a guide for material engineering of effects related to chiral dynamics in magnetic textures with SOC.

本文言語English
論文番号184424
ジャーナルPhysical Review B
98
18
DOI
出版ステータスPublished - 2018 11 21
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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