2016 Fiscal Year Final Research Report
Study of spin dynamics in diluted magnetic materials using the soft X-ray resonant Kerr effect
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 |
Section | 一般 |
Research Field |
Condensed matter physics II
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Research Institution | The University of Tokyo |
Principal Investigator |
Matsuda Iwao 東京大学, 物性研究所, 准教授 (00343103)
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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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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 |
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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Free Research Field |
磁気光学効果
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