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http://dx.doi.org/10.4283/JKMS.2015.25.2.039

Analyses of Laser Induced Demagnetization and Remagnetization in Carbon Doped FePt Thin Films  

Song, Hyon-Seok (Department of Emerging Materials Science, DGIST)
Ko, Hyun Seok (Department of Physics and CNSM, KAIST)
Hong, Jung-Il (Department of Emerging Materials Science, DGIST)
Shin, Sung-Chul (Department of Emerging Materials Science, DGIST)
Lee, Kyeong-Dong (Department of Materials Science and Engineering, KAIST)
Park, Byong-Guk (Department of Materials Science and Engineering, KAIST)
Publication Information
Journal of the Korean Magnetics Society / v.25, no.2, 2015 , pp. 39-42 More about this Journal
Abstract
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 $L1_0$ 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.
Keywords
C doped FePt; demagnetization; remagnetization; TR-MOKE;
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Times Cited By KSCI : 1  (Citation Analysis)
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