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Spin Hall voltages from a.c. and d.c. spin currents.

ABSTRACT: In spin electronics, the spin degree of freedom is used to transmit and store information. To this end the ability to create pure spin currents--that is, without net charge transfer--is essential. When the magnetization vector in a ferromagnet-normal metal junction is excited, the spin pumping effect leads to the injection of pure spin currents into the normal metal. The polarization of this spin current is time-dependent and contains a very small d.c. component. Here we show that the large a.c. component of the spin currents can be detected efficiently using the inverse spin Hall effect. The observed a.c.-inverse spin Hall voltages are one order of magnitude larger than the conventional d.c.-inverse spin Hall voltages measured on the same device. Our results demonstrate that ferromagnet-normal metal junctions are efficient sources of pure spin currents in the gigahertz frequency range.

SUBMITTER: Wei D 

PROVIDER: S-EPMC4015325 | biostudies-other | 2014

REPOSITORIES: biostudies-other

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Spin Hall voltages from a.c. and d.c. spin currents.

Wei Dahai D   Obstbaum Martin M   Ribow Mirko M   Back Christian H CH   Woltersdorf Georg G  

Nature communications 20140430

In spin electronics, the spin degree of freedom is used to transmit and store information. To this end the ability to create pure spin currents--that is, without net charge transfer--is essential. When the magnetization vector in a ferromagnet-normal metal junction is excited, the spin pumping effect leads to the injection of pure spin currents into the normal metal. The polarization of this spin current is time-dependent and contains a very small d.c. component. Here we show that the large a.c.  ...[more]