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

被引：34

作者：

Iihama, S. ^{[1
]}

Sasaki, Y. ^{[1
]}

Sugihara, A. ^{[2
]}

Kamimaki, A. ^{[1
]}

Ando, Y. ^{[1
]}

Mizukami, S. ^{[2
]}

机构：

[1] Tohoku Univ, Dept Appl Phys, Grad Sch Engn, Sendai, Miyagi 980, Japan

[2] Tohoku Univ, WPI Adv Inst Mat Res, Sendai, Miyagi 980, Japan

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.94.020401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Coherent spin-wave generation by focused ultrashort laser pulse irradiation was investigated for a permalloy thin film atmicrometer scale using an all-optical space-and time-resolved magneto-opticalKerr 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.

引用

页数：5

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