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arXiv · 1601.07247

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

S. Iihama·Y. Sasaki·A. Sugihara·A. Kamimaki·Y. Ando·S. Mizukami
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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. The spin-wave packet propagating perpendicular to 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 magneto-static spin-wave driven by ultrafast change of an out-of-plane demagnetization field induced by the focused-pulse laser.

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S. Iihama, Y. Sasaki, A. Sugihara, A. Kamimaki, Y. Ando, S. Mizukami. 2016-01-27. Quantification of a propagating spin-wave-packet created by an ultrashort laser pulse in a thin film of magnetic metal. https://doi.org/10.1103/physrevb.94.020401

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