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arXiv · 2212.11698

Tunneling anisotropic spin galvanic effect

Geneviève Fleury·Michael Barth·Cosimo Gorini
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Abstract

We show that pure spin injection from a magnetic electrode into an inversion symmetry-broken system composed of a tunnel barrier and a metallic region generates a transverse charge current. Such a tunnelling spin galvanic conversion is robust to disorder and non-local, i.e. injection and detection contacts do not coincide, and is strongly anisotropic whenever the internal spin-orbit field has a non-trivial angular dependence. The anisotropy shows up in linear response, contrary to what happens in bulk conversion setups lacking tunnelling elements. This is particularly relevant for spin-charge conversion at oxide interfaces, where both the tunnel barrier and the receiving low-dimensional metallic system host effective spin-orbit fields with complex angular symmetries.

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Geneviève Fleury, Michael Barth, Cosimo Gorini. 2022-12-22. Tunneling anisotropic spin galvanic effect. https://doi.org/10.1103/physrevb.108.l081402

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