| Project/Area Number |
15560044
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | University of Hyogo (2004)
Himeji Institute of Technology (2003) |
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Principal Investigator |
TAKAGI Yoshihiro University of Hyogo, Graduate School of Material Science, 大学院・物質理学研究科・物質理学専攻, 教授 (80106161)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIKAWA Kiyoshi University of Hyogo, Graduate School of Material Science, 大学院・物質理学研究科・物質理学専攻, 助教授 (00212837)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2003: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | Photo-induced phenomena / Spin polarization / Magnetism / Nanosecond / Free induction decay(FID) |
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| Research Abstract |
It is elucidated experimentally that the magnetic response to light irradiation is very diverse in magnetic materials. When the material is irradiated by a circularly polarized light for paramagnetic complexes angular momentum is transferred to the spin system giving rise to different polarities in spin orientation depending on the absorption bands resulting from the symmetry of spin-orbit coupling. Also, for Fe(III) spin system in organic solution with S=5/2 photo-induced Zeeman coherence was successfully detected as a free-induction decay signal in the external magnetic field perpendicular to the light beam. On the other hand regardless of light polarization optically initiated Zeeman state mixing in the presence of magnetic field creates adiabatic spin orientation and exhibits characteristic magnetic-field dependence. For a particular case such a spin orientation by the state mixing can contribute to identification of mono-nuclear complex and di-nuclear complex. For magnetically ordered systems although the magnetic responses to light irradiation are mostly those originating from heat injection, interesting photo-triggered effects such as the fast domain-wall oscillation and magnetization inversion depending on the applied magnetic field, light intensity, and temperature.
A variety of photo-responses mentioned above are all detected with the nanosecond time resolution. These responses strongly suggest interest and importance of further improvement of time resolution in magnetic detection.
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