Electrical detection of spin currents: The spin-current induced Hall effect (invited)

被引：0

作者：

Valenzuela, S.O. ^{[1
]}

Tinkham, M. ^{[2
]}

机构：

[1] MIT Francis Bitter Magnet Laboratory, Cambridge, MA 02139, United States

[2] Physics Department, Harvard University, Cambridge, MA 02138, United States

来源：

Journal of Applied Physics | 2007年 / 101卷 / 09期

关键词：

We demonstrate electrical detection of spin currents in metallic nanostructures. In a conductor with nonzero spin-orbit coupling; a spin current is predicted in a direction perpendicular to the applied electric field; giving rise to a spin Hall effect; where electrons with opposite spin orientations accumulate at opposite edges of the sample. Conversely; when a spin current is present; a charge imbalance is expected; following the Onsager reciprocal relations between spin and charge currents. We report direct electronic measurements of this effect in a lateral geometry by using a ferromagnetic electrode in combination with a tunnel barrier to inject a spin-polarized current in a paramagnetic conductor. We observe a laterally induced voltage in the latter that results from the conversion of the injected spin current into charge imbalance owing to the spin-orbit coupling. Such a voltage is proportional to the component of the injected spins that is perpendicular to the plane defined by the spin-current direction and the voltage probes. By using this technique in CoFe- Al2 O3 -Al devices; we determine the spin Hall conductivity of aluminum. © 2007 American Institute of Physics;

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摘要：

Conference article (CA)

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