Effective nonlocal spin injection through low-resistance oxide junctions

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:405

Article

Cai, Yunjiao¹  Luo, Yongming^2,3  Qin, Chuan¹  Chen, Shuhan¹  Wu, Yizheng²  Ji, Yi¹ 

[1] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[2] Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China

[3] Hangzhou Dianzi Univ, Ctr Integrated Spintron Devices, Hangzhou 310018, Zhejiang, Peoples R China

关键词: Spin injection;    Nonlocal spin valve;    Pure spin current;    Spin transport;    Nonlocal spin polarization;    Low-resistance oxide junction;   

DOI  :  10.1016/j.jmmm.2015.12.050

来源: Elsevier

【 摘 要 】

Many ( > 40) nonlocal spin valves on the same substrate have been characterized at 6 K and 295 K by using a probe station. Low -resistance oxide junctions (0.2-0.8 Omega) are used to inject spin current into mesoscopic Cu channels. Spin signals exceeding 10 m Omega at 6 K have been consistently observed, indicating efficient spin injection and detection. However, complex switching behavior and possible variations between devices pose a challenge to using a standard fitting method to quantify the spin signals. Two methods are used for quantitative analysis. The range of the effective spin polarizations can be estimated by assuming a reasonable range for the Cu spin diffusion lengths. A nonlocal spin polarization is introduced to evaluate the spin current in the Cu channels. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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