Ultrafast spin current generated by electron-magnon scattering in bulk of ferromagnets

Im Hyuk Shin, Byoung Chul Min, Byeong Kwon Ju, Gyung Min Choi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The ultrafast demagnetization of metallic ferromagnets can generate a spin current in metallic nonmagnets in a ferromagnet/nonmagnet structure. Two different mechanisms for this phenomenon have been suggested: spin-dependent transport of hot electrons and spin generation by electron-magnon scattering. In this work, we optically measure a transient spin accumulation on a nonmagnetic Cu layer driven by the ultrafast demagnetization of a ferromagnet (Fe, Co, and Ni). The modeling based on the spin generation by electron-magnon scattering in bulk ferromagnets (namely, bulk spin pumping) well explains the dynamics and magnitude of the measured spin accumulation on Cu.

Original languageEnglish
Article number090307
JournalJapanese Journal of Applied Physics
Volume57
Issue number9
DOIs
Publication statusPublished - 2018 Sep 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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