Ultrafast magnetization relaxation of L10-ordered Fe50Pt50 alloy thin film

Kim, Ji-Wan; Song, Hyon-Seok; Jeong, Jae-Woo; Lee, Kyeong-Dong; Sohn, Jeong-Woo; Shima, Toshiyuki; Shin, Sung-Chul
February 2011
Applied Physics Letters;2/28/2011, Vol. 98 Issue 9, p092509
Academic Journal
We have investigated the ultrafast magnetization dynamics of L10-ordered Fe50Pt50 thin film by means of a time-resolved magneto-optical Kerr effect measurement. We have found a high Gilbert damping value of α∼0.26, together with a very high precession frequency of f∼85 GHz and the shortest relaxation characteristic time of τ∼6.5 ps ever reported. We believe that L10-ordered FePt film with the unique property of a very high precession frequency and the shortest relaxation time will be very useful for the realization of picosecond spin switching.


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