| Project/Area Number |
16K17722
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics I
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Wadati Hiroki 東京大学, 物性研究所, 准教授 (00579972)
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 磁化反転 / レーザー / X線 / X線自由電子レーザー / SACLA / 強磁性 / 薄膜 / 合金 / 酸化物 / ペロブスカイト / シンクロトロン / ダブルペロブスカイト / 磁性 / 強相関電子系 / Ｘ線 / 表面・界面物性 / 物性実験 |
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| Outline of Final Research Achievements |
We tried to reveal the mechanism of magnetization reversal in ferromagnets by laser. As an experimental technique, we used time-resolved x-ray spectroscopy by synchronicity-radiation x-ray and x-ray free electron laser (XFEL). We mainly measured x-ray magnetic circular dichroism (XMCD). We performed time-resolved XMCD measurements in BL3 in SACLA (XFEL facility in Japan). By shining 800 nm Ti:sapphire laser as a pump light onto alloy FePt thin films with room-temperature ferromagnetism, we succeeded in time-resolved XMCD measurements at Pt L edges. The time scale of demagnetization is about 1 ps, found to be longer than that of Fe sites. Such element-resolved spin dynamics was first revealed by time-resolved XMCD.
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