フェムト秒レーザーを用いたMAMMOS媒体の磁化ダイナミクス計測(磁気光学・光磁気記録)

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This paper describes results of a time-resolved study of the ultrafast magnetic response of Gd_<23.1>Fe_<71.9>Co_<5.0> MAMMOS structures under conditions near actual read temperature. 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 magnetooptical 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.
社団法人日本磁気学会の論文
2004-03-01