Microscopic Calculation of Spin Torques in Disordered Ferromagnets(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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Effects of conduction electrons on magnetization dynamics, represented by spin torques, are calculated microscopically in the first order in spatial gradient and time derivative of magnetization. Special attention is paid to the so-called β-term and the Gilbert damping, α, in the presence of electrons' spin-relaxation processes, which are modeled by quenched magnetic (and spin-orbit) impurities. It is shown that these two torque terms actually arise from the spin relaxation processes, both transverse and longitudinal, and their coefficients are different, α≠β, in general. These features hold for both localized and itinerant models for ferromagnetism.
- 社団法人日本物理学会の論文
- 2006-11-15
著者
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Tatara Gen
Graduate School Of Science And Engineering Tokyo Metropolitan University:presto Jst
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KOHNO Hiroshi
Graduate School of Engineering Science, Osaka University
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Kohno Hiroshi
Graduate School Of Engineering Science Osaka University
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Shibata Junya
Kanagawa Institute Of Technology
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SHIBATA Junya
RIKEN-FRS
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Tatara Gen
Graduate School Of Science And Engineering Tokyo Metropolitan University:presto Japan Science And Te
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