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, Kyoung Jin Lee

    Research output: Contribution to journalArticlepeer-review

    57 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 Sept 28

    Bibliographical note

    Publisher Copyright:
    © 2017 American Physical Society.

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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