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Spin Currents Induced by Nonuniform Rashba-Type Spin-Orbit Field

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.

preprint2011arXivOpen access
Kazuhiro TsutsuiAkihito TakeuchiGen TataraShuichi Murakami
cond-mat.mes-hallcond-mat.mtrl-sci
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Kazuhiro TsutsuiAkihito TakeuchiGen TataraShuichi Murakami

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