| Project/Area Number |
26400328
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Matsuda Iwao 東京大学, 物性研究所, 准教授 (00343103)
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| Co-Investigator(Kenkyū-buntansha) |
山本 達 東京大学, 物性研究所, 助教 (50554705)
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| Research Collaborator |
Moras P. Instituto di Struttura della Materia, Consiglio Nazionalle delle Ricerche
Kiskinova M. Elettra-Sincrotrone Trieste
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 磁気光学効果 / 軟X線 / 自由電子レーザー / 磁性体 / スピンダイナミクス / カー効果 / 共鳴磁気光学カー効果 / スピントロニクス / 高次高調波レーザー / 磁気光学 / 磁性 / レーザー / 放射光 |
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| Outline of Final Research Achievements |
The magneto-optical Kerr effect (MOKE) has been used to investigate magnetic information of materials. Tuning the probing photon energy at an absorption-edge of a material, typically in the ultra-vacuum ray to soft X-ray region, we discovered that the Kerr rotation angles become several 10 times larger than those measured with the conventional visible light. Since this resonant MOKE allows us to probe a magnetic material with element selectivity, large-signals and a possible extension to the time-resolved measurement, we developed the technique in the present research. Using a ultrashort-pulse soft X-ray laser, such as a free electron laser, we succeeded in tracing ultrafast spin inversion at the Fe atom in a GdFeCo crystal and in performing the femto-seconds time-resolved measurement on < 1nm-thick Fe film buried in the heterostructure.
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