Roles of chiral renormalization on magnetization dynamics in chiral magnets

Kyoung Whan Kim, Hyun Woo Lee, Kyoung Jin Lee, Karin Everschor-Sitte, Olena Gomonay, Jairo Sinova

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In metallic ferromagnets, the interaction between local magnetic moments and conduction electrons renormalizes parameters of the Landau-Lifshitz-Gilbert equation, such as the gyromagnetic ratio and the Gilbert damping, and makes them dependent on the magnetic configurations. Although the effects of the renormalization for nonchiral ferromagnets are usually minor and hardly detectable, we show that the renormalization does play a crucial role for chiral magnets. Here the renormalization is chiral, and as such we predict experimentally identifiable effects on the phenomenology of magnetization dynamics. In particular, our theory for the self-consistent magnetization dynamics of chiral magnets allows for a concise interpretation of domain-wall creep motion. We also argue that the conventional creep theory of the domain-wall motion, which assumes Markovian dynamics, needs critical reexamination since the gyromagnetic ratio makes the motion non-Markovian. The non-Markovian nature of the domain-wall dynamics is experimentally checkable by the chirality of the renormalization.

Original languageEnglish
Article number100402
JournalPhysical Review B
Volume97
Issue number10
DOIs
Publication statusPublished - 2018 Mar 12

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Magnets
Magnetization
Domain walls
magnets
domain wall
magnetization
Creep
Chirality
Magnetic moments
phenomenology
chirality
conduction electrons
Damping
magnetic moments
damping
Electrons
configurations
electrons
interactions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Kim, K. W., Lee, H. W., Lee, K. J., Everschor-Sitte, K., Gomonay, O., & Sinova, J. (2018). Roles of chiral renormalization on magnetization dynamics in chiral magnets. Physical Review B, 97(10), [100402]. https://doi.org/10.1103/PhysRevB.97.100402

Roles of chiral renormalization on magnetization dynamics in chiral magnets. / Kim, Kyoung Whan; Lee, Hyun Woo; Lee, Kyoung Jin; Everschor-Sitte, Karin; Gomonay, Olena; Sinova, Jairo.

In: Physical Review B, Vol. 97, No. 10, 100402, 12.03.2018.

Research output: Contribution to journalArticle

Kim, KW, Lee, HW, Lee, KJ, Everschor-Sitte, K, Gomonay, O & Sinova, J 2018, 'Roles of chiral renormalization on magnetization dynamics in chiral magnets', Physical Review B, vol. 97, no. 10, 100402. https://doi.org/10.1103/PhysRevB.97.100402
Kim, Kyoung Whan ; Lee, Hyun Woo ; Lee, Kyoung Jin ; Everschor-Sitte, Karin ; Gomonay, Olena ; Sinova, Jairo. / Roles of chiral renormalization on magnetization dynamics in chiral magnets. In: Physical Review B. 2018 ; Vol. 97, No. 10.
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