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arXiv · 2002.08639

Study of the spin-pump-induced inverse spin-Hall effect in Bi doped n-type Si

A. A. Ezhevskii·D. V. Guseinov·A. V. Soukhorukov·A. V. Novikov·D. V. Yurasov·N. S. Gusev
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Abstract

An inverse spin Hall effect (ISHE) in n-type silicon was observed experimentally when conduction electrons were scattered on the spin-orbit potential of bismuth. The spin current in the silicon layer was generated by excitation of the magnetization precession during ferromagnetic resonance in a thin permalloy (Py) layer deposited on a Si layer doped by phosphor and bismuth. From the angular dependences of the dc voltage for different Py/n-Si:Bi structures aligned along the [011] or [100] crystal axes, we were able to distinguish the planar Hall effect (PHE) and ISHE contributions. The ISHE dc voltage signal was proportional to sin{\theta}*sin2{\theta} product for the structure aligned to the [011] crystal axis and to sin{\theta}*cos2{\theta} for the [100] direction. In addition, the PHE dc voltage was observed for the angles corresponded to the sin2{\theta} dependence. It means that for silicon as a many-valley semiconductor, the scattering of spins due to the spin-orbit potential induced by shallow donor in n-type material is dependent on the orientation of the valley axes relative to the direction of the magnetic field.

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A. A. Ezhevskii, D. V. Guseinov, A. V. Soukhorukov, A. V. Novikov, D. V. Yurasov, N. S. Gusev. 2020-02-20. Study of the spin-pump-induced inverse spin-Hall effect in Bi doped n-type Si. https://doi.org/10.1103/physrevb.101.195202

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