Spin Currents Induced by Nonuniform Rashba-Type Spin--Orbit Field
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概要
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We study the spin relaxation torque in nonmagnetic or ferromagnetic metals with nonuniform spin--orbit coupling within the Keldysh Green's function formalism. In non-magnet, the relaxation torque is shown to arise when the spin--orbit coupling is not uniform. In the absence of an external field, the spin current induced by the relaxation torque is proportional to the vector chirality of Rashba-type spin--orbit field (RSOF). In the presence of an external field, on the other hand, spin relaxation torque arises from the coupling of the external field and vector chirality of RSOF. Our result indicates that spin-sink or source effects are controlled by designing RSOF in junctions.
- 2011-08-15
著者
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Tatara Gen
Department Of Earth And Space Science Osaka University
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Takeuchi Akihito
Department Of Child Neurology Okayama University Graduate School Of Medicine Dentistry And Pharmaceu
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Murakami Shuichi
Department Of Applied Physics University Of Tokyo
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Takeuchi Akihito
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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Tsutsui Kazuhiro
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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Murakami Shuichi
Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
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