[17a-F202-1~11] 7.4 Buried interface sciences with quantum beam

△ [17a-F202-5] Magnetization dynamics of FePt thin films measured by time-resolved x-ray magnetic circular dichroism at Pt L edge

〇Kohei Yamamoto^1,2, Yuya Kubota³, Yasuyuki Hirata^1,2, Kou Takubo¹, Youhei Uemura⁴, Kenta Tanaka⁵, Wataru Nishimura⁵, Takuo Ohkochi³, Motohiro Suzuki³, Tetsuo Katayama³, Tadashi Togashi³, Kenji Tamasaku⁶, Makina Yabashi³, Yoshihito Tanaka⁵, Takeshi Seki⁷, Koki Takanashi⁷, Hiroki Wadati^1,2 (1.ISSP, Univ. of Tokyo, 2.Dept. of Phys., Univ. of Tokyo, 3.JASRI, 4.IMS, 5.Dept. of Mat. Sci., Univ. of Hyogo, 6.RIKEN, 7.IMR, Tohoku Univ.)

Keywords:XFEL, time-resolved XMCD

Element resolved information of light induced transient states is important for the study of light control of magnetization. In order to obtain such information, time-resolved x-ray magnetic circular dichroism (XMCD) measurement is a powerful technique. X-ray at Pt L edge which reflects the magnetic state of Pt is hard x-ray and expected time scale is a few ps. That is why we performed time-resolved XMCD measurement for FePt thin film at SACLA BL3. We succeeded in obtaining demagnetization and recovery time scale. We will report the results comparing Fe L edge results.