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arXiv · 1610.00249

Spin galvanic effect at the conducting SrTiO3 surfaces

Wenxu Zhang·Qiuru Wang·Bin Peng·Huizhong Zeng·Wee Tee Soh·Chong Kim Ong·Wanli Zhang
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Abstract

The (001) surface of SrTiO3 were transformed from insulating to conducting after Ar+ irradiation, producing a quasi two-dimensional electron gas (2DEG). This conducting surface layer can introduce Rashba spin orbital coupling due to the broken inversion symmetry normal to the plane. The spin splitting of such a surface has recently been demonstrated by magneto-resistance and angular resolved photoemission spectra measurements. Here we present experiments evidencing a large spin-charge conversion at the surface. We use spin pumping to inject a spin current from NiFe film into the surface, and measure the resulting charge current. The results indicate that the Rashba effect at the surface can be used for efficient charge-spin conversion, and the large efficiency is due to the multi-d-orbitals and surface corrugation. It holds great promise in oxide spintronics.

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Wenxu Zhang, Qiuru Wang, Bin Peng, Huizhong Zeng, Wee Tee Soh, Chong Kim Ong, Wanli Zhang. 2016-10-02. Spin galvanic effect at the conducting SrTiO3 surfaces. https://doi.org/10.1063/1.4973479

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