Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics

Se Hyeok Oh, Se Kwon Kim, Dong Kyu Lee, Gyungchoon Go, Kab Jin Kim, Teruo Ono, Yaroslav Tserkovnyak, Kyung Jin Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We theoretically study the dynamics of ferrimagnetic domain walls in the presence of a Dzyaloshinskii-Moriya interaction. We find that an application of a dc magnetic field can induce terahertz spin-wave emission by driving ferrimagnetic domain walls, which is not possible for ferromagnetic or antiferromagnetic domain walls. The Dzyaloshinskii-Moriya interaction is shown to facilitate terahertz spin-wave emission in a wide range of the net angular momentum by increasing the Walker breakdown field. Moreover, we show that spin-orbit torque combined with the Dzyaloshinskii-Moriya interaction also drives fast ferrimagnetic domain wall motion by emitting terahertz spin waves in a wide range of the net angular momentum.

Original languageEnglish
Article number100407
JournalPhysical Review B
Volume96
Issue number10
DOIs
Publication statusPublished - 2017 Sep 28

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Oh, S. H., Kim, S. K., Lee, D. K., Go, G., Kim, K. J., Ono, T., Tserkovnyak, Y., & Lee, K. J. (2017). Coherent terahertz spin-wave emission associated with ferrimagnetic domain wall dynamics. Physical Review B, 96(10), [100407]. https://doi.org/10.1103/PhysRevB.96.100407