Excitation of Coherent Spin Waves in GdFeCo film

A. Tsukamoto; K. Nakagawa; A. Itoh; A. Kimel; A. Tsvetkov; H. Awano; N. Ohta; A. Kirilyuk; Th. Rasing

doi:10.3379/tmjpn2001.4.322

A. Tsukamoto, K. Nakagawa, A. Itoh, A. Kimel, A. Tsvetkov, H. Awano, N. Ohta, A. Kirilyuk, Th. Rasing

著者情報

キーワード: MAMMOS, magnetization precession, thermo-magnetic writing

ジャーナルフリー

2004 年 4 巻 4-2 号 p. 322-325

DOI https://doi.org/10.3379/tmjpn2001.4.322

詳細

抄録

We present results of a time-resolved study of the ultrafast magnetic response of Gd_23.1Fe_71.9Co_5.0 MAMMOS structures under conditions near actual read/write temperatures. An all-optical pump and probe method was used in which an intense (pump) light beam excited a medium due to ultrafast laser heating and a less intense (probe) beam monitored this photo-excited state through the magneto-optical Kerr effect. Our experiment clearly demonstrates that the photo-excitation effectively excites coherent spin waves in the magnetic material. Precession frequencies of several GHz and relaxation times in the nanosecond range were observed.

責任著者(Corresponding author)

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