Quantification of a propagating spin-wave packet created by an ultrashort laser pulse in a thin film of a magnetic metal

S. Iihama, Y. Sasaki, A. Sugihara, A. Kamimaki, Y. Ando, S. Mizukami

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Coherent spin-wave generation by focused ultrashort laser pulse irradiation was investigated for a permalloy thin film at micrometer scale using an all-optical space- and time-resolved magneto-optical Kerr effect microscope. The spin-wave packet propagating perpendicular to the magnetization direction was clearly observed; however, that propagating parallel to the magnetization direction was not observed. The propagation length, group velocity, center frequency, and packet width of the observed spin-wave packet were evaluated and quantitatively explained in terms of the propagation of a magnetostatic spin wave driven by the ultrafast change of an out-of-plane demagnetization field induced by the focused-pulse laser.

Original languageEnglish
Article number020401
JournalPhysical Review B
Volume94
Issue number2
DOIs
Publication statusPublished - 2016 Jul 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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