Volume 118, Number 6, June 2017
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||29 August 2017|
Conditions for the generation of spin and charge currents in bulk spin Hall devices
1 Ecole Polytechnique, LSI, CNRS and CEA/DSM/IRAMIS - Palaiseau, F-91128, France
2 Departament de Física Fonamental, Fascultat de Física, Universitat de Barcelona - Barcelona, E-08028, Spain
Received: 16 June 2017
Accepted: 31 July 2017
We investigate the out-of-equilibrium stationary states of spin Hall devices on the basis of the least dissipation principle in the two-spin-channel model. The variational technique allows the values of the free parameters of the Hall device to be derived. The free parameters are the chemical potentials, the transverse Hall currents and the charge accumulations in the two spin channels. We show that, for a bulk paramagnet with spin-orbit interaction, in the case of the Hall bar geometry the principle of minimum dissipated power prevents the generation of transverse spin and charge currents, while in the case of the Corbino disk geometry, transverse currents, can be produced. More generally, we show that electric charge accumulation prevents the stationary spin to charge current conversion from occurring inside the device.
PACS: 72.25.Mk – Spin transport through interfaces / 85.75.-d – Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
© EPLA, 2017
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