Roles of chiral renormalization on magnetization dynamics in chiral magnets

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

Research output: Contribution to journalArticlepeer-review

8 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

Bibliographical note

Funding Information:
We acknowledge M. D. Stiles, Y. Tserkovnyak, A. Thiaville, S.-W. Lee, V. Amin, and D.-S. Han for fruitful discussions. This Rapid Communication was supported by the Alexander von Humboldt Foundation, the ERC Synergy Grant SC2 (Grant No. 610115), the Transregional Collaborative Research Center (SFB/TRR) 173 SPIN+X, and the German Research Foundation (DFG) (Grant No. EV 196/2-1 and No. SI 1720/2-1). K.-W.K also acknowledges support from the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. 2016R1A6A3A03008831). H.-W.L. was supported by the NRF (Grant No. 2011-0030046). K.-J.L was supported by the NRF (Grants No.2015M3D1A1070465 and No. 2017R1A2B2006119).

Publisher Copyright:
© 2018 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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