Closed-loop electric currents and non-local resistance measurements with wide F/I/N tunnel contacts

Ya. B. Bazaliy; R. R. Ramazashvili

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arXiv · 1911.01034

Closed-loop electric currents and non-local resistance measurements with wide F/I/N tunnel contacts

Ya. B. Bazaliy·R. R. Ramazashvili

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Abstract

Lateral spin valves are used to generate and characterize pure spin currents. Non-local voltage measured in such structures provides information about spin polarization and spin decay rates. For wide high-transparency F/N contacts it was shown that the Johnson-Silsbee non-local effect is substantially enriched by closed-loop electric currents driven by local spin injection in the electrically dangling part of the valve. For valves with low-transparency F/I/N tunnel contacts such circular currents are strongly suppressed, yet we show that the voltage modifications persist, may be significant, and must be accounted for in the data analysis.

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Ya. B. Bazaliy, R. R. Ramazashvili. 2019-11-04. Closed-loop electric currents and non-local resistance measurements with wide F/I/N tunnel contacts. https://arxiv.org/abs/1911.01034

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