Micro-Focused Pulse Laser-Induced Propagating Spin Waves in Permalloy Films With Different Thicknesses

Akira Kamimaki, Satoshi Iihama, Yuta Sasaki, Yasuo Ando, Shigemi Mizukami

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Propagating spin waves excited by a micro-focused ultra-short pulse laser were investigated in Permalloy films with the thicknesses of 20, 50, and 100 nm by means of an all-optical space-and-time-resolved magneto-optical Kerr effect. Although various perpendicular standing spin-wave modes were excited, the propagating magneto-static surface spin wave was clearly detected in each film, where the group velocities of approximately 4, 8, and 12 km/s and the propagation lengths of 3.8, 6.6, and 13 μm for the 20, 50, and 100 nm-thick films, respectively, were evaluated. The evaluated group velocities were consistent with the theoretical values, whereas the propagation lengths were smaller than the theoretical values with the Gilbert damping constant α of 0.008.

Original languageEnglish
Article number7934088
JournalIEEE Transactions on Magnetics
Issue number11
Publication statusPublished - 2017 Nov


  • Magneto-static surface wave (MSSW)
  • propagating spin wave (PSW)
  • space-and-time-resolved magneto-optical Kerr effect (STR-MOKE)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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