Effect of the low-resistance tunnel barriers induced inhomogeneous spin current distribution in graphene crossed configuration lateral spin valve
Source abstract
Abstract
The nonlocal spin valve configuration consists of two ferromagnetic and nonmagnetic channels, which is an effective configuration for determining spin injection and accumulation. Here, we report that a reversed nonlocal spin signal was detected by changing the voltage probe configurations in graphene (Py/MgO/graphene/MgO/Py) lateral spin valves. The abnormal reversed spin-dependent nonlocal voltage is attributed to the nonuniform pinhole at the interface of the low-resistance tunnel barrier, which makes the charge current flow through the detection electrode and return to the graphene channel. We demonstrate that the channel-width induced spin-polarized current inhomogeneity significantly contributes to nonlocal resistance. A detailed description and simulated results of the tunnel junctions provide evidence for the reversal of the nonlocal voltage sign induced by the low-resistance tunnel barriers. Our work sheds light on the understanding of the spatial distribution of the spin current and the effect of the tunnel barrier, which are essential for the development of spintronic devices.
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Research context
OpenAlex topics: Graphene research and applications · Quantum and electron transport phenomena · Advancements in Battery Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Physics and Electronics, Hunan Key Laboratory for Super-Microstructure and Ultrafast Process, Central South University 1 , 932 South Lushan Road, Changsha, Hunan 410083, People’s Republic of China
Shenzhen Research Institute of Central South University 2 , A510a, Virtual University Building, Southern District, High-Tech Industrial Park, Yuehai Street, Nanshan District, Shenzhen, China
State Key Laboratory of High Performance Complex Manufacturing, Central South University 3 , 932 South Lushan Road, Changsha, Hunan 410083, People’s Republic of China
School of Electronics and Information, Hangzhou Dianzi University 4 , 1158 Second Street, Xiasha College Park, Hangzhou, Zhejiang 310018, China
School of Chemical and Biomolecular Engineering, The University of Sydney 5 , NSW 2006, Australia
Funding
National Natural Science Foundation of China
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