Spin galvanic effect at the conducting SrTiO3 surfaces

被引:19
作者
Zhang, Wenxu [1 ]
Wang, Qiuru [1 ]
Peng, Bin [1 ]
Zeng, Huizhong [1 ]
Soh, Wee Tee [2 ]
Ong, Chong Kim [2 ,3 ]
Zhang, Wanli [1 ]
机构
[1] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China
[2] Natl Univ Singapore, Dept Phys, Ctr Superconducting & Magnet Mat, 2 Sci Dr 3, Singapore 117551, Singapore
[3] Natl Univ Singapore, Temasek Labs, 5A Engn Dr 2, Singapore 117411, Singapore
关键词
TO-CHARGE CONVERSION; ELECTRON-GAS; POLARIZATION;
D O I
10.1063/1.4973479
中图分类号
O59 [应用物理学];
学科分类号
摘要
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 conducting 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. The conversion efficiency measured by the ratio of the spin flow density to the charge flow density is about 0.23 nm. This value is on the same order as the interfaces in metallic multilayers and 2DEG of LaAlO3/SrTiO3. In this point of view, the conducting SrTiO3 surface provides another solution for oxide spintronics. Published by AIP Publishing.
引用
收藏
页数:5
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