Ultrafast coherent control of higher-order spin waves in a NiFe thin film by double-pulse excitation

Makoto Okano, Tomohiro Takahashi, Shinichi Watanabe

研究成果: Article査読

抄録

By using a double-pulse excitation scheme, we demonstrate the optical control of higher-order spin waves in a ferromagnetic permalloy thin film. Three spin precession modes are observed in the film under single pulse excitation. Based on a theoretical calculation, these spin precession modes are assigned to the fundamental Kittel mode and the first- and second-order perpendicular standing spin-wave (PSSW) modes. In order to excite the first-order PSSW mode selectively, we use double-pulse excitation at 400 nm. We show that, by choosing an appropriate time interval between the two pump pulses, it is possible to obtain a relatively large amplitude of the first-order PSSW mode while the amplitudes of the other two modes are almost completely suppressed. By analyzing the spin dynamics, it is found that the spin precession motion under the double-pulse excitation condition can be explained by the interference between the spin waves that have been induced by the first and second pulses. Our finding indicates that the selective excitation of a spin precession mode with a high precession frequency in a ferromagnetic metal may be realized by a multiple-pump pulse excitation scheme with more than two pulses.

本文言語English
論文番号082407
ジャーナルApplied Physics Letters
117
8
DOI
出版ステータスPublished - 2020 8 24

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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