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Spin accumulation in ferromagnetic single-electron transistors in the cotunneling regime

Jan Martinek·Józef Barnas·Sadamichi Maekawa·Herbert Schoeller·Gerd Schön
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Abstract

We propose a new method of direct detection of spin accumulation, which overcomes problems of previous measurement schemes. A spin dependent current in a single-electron transistor with ferromagnetic electrodes leads to spin accumulation on the metallic island. The resulting spin-splitting of the electrochemical potentials of the island, because of an additional shift by the charging energy, can be detected from the spacing between two resonances in the current-voltage characteristics. The results were obtained in the framework of a real-time diagrammatic approach which allows to study higher order (co-)tunneling processes in the strong nonequlibrium situation.

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Jan Martinek, Józef Barnas, Sadamichi Maekawa, Herbert Schoeller, Gerd Schön. 2002-04-16. Spin accumulation in ferromagnetic single-electron transistors in the cotunneling regime. https://doi.org/10.1103/physrevb.66.014402

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