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탄소가 도핑 된 FePt 박막에서의 펨토 초 펄스 레이저에 의한 자기 소거와 회복 분석
송현석(Hyon-Seok Song),고현석(Hyun Seok Ko),홍정일(Jung-Il Hong),신성철(Sung-Chul Shin),이경동(Kyeong-Dong Lee),박병국(Byong-Guk Park) 한국자기학회 2015 韓國磁氣學會誌 Vol.25 No.2
After preparing carbon-doped FePt films by dc magnetron sputtering, we observed ultrafast demagnetization and its recovery by means of a time-resolved magneto-optical Kerr effect technique. We confirm that the degree of L10 ordering is decreased and coercivity is changed, as the carbon concentration increases. All samples are demagnetized within ~5 ps after the femtosecond laser pulse heated the sample. Interestingly, ultrafast relaxation time, which indicates fast magnetization recovery, increases as the carbon concentration increases due to the low spin-orbit coupling of carbon.