Electric-field control of spin-orbit torque in a magnetically doped topological insulator
| Autor: | Fan, Yabin, Kou, Xufeng, Upadhyaya, Pramey, Shao, Qiming, Pan, Lei, Lang, Murong, Che, Xiaoyu, Tang, Jianshi, Montazeri, Mohammad, Murata, Koichi, Chang, Li-Te, Akyol, Mustafa, Yu, Guoqiang, Nie, Tianxiao, Wong, Kin L., Liu, Jun, Wang, Yong, Tserkovnyak, Yaroslav, Wang, Kang L. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/nnano.2015.294 |
| Popis: | Electric-field manipulation of magnetic order has proved of both fundamental and technological importance in spintronic devices. So far, electric-field control of ferromagnetism, magnetization and magnetic anisotropy has been explored in various magnetic materials, but the efficient electric-field control of spin-orbit torque (SOT) still remains elusive. Here, we report the effective electric-field control of a giant SOT in a Cr-doped topological insulator (TI) thin film using a top-gate FET structure. The SOT strength can be modulated by a factor of 4 within the accessible gate voltage range, and it shows strong correlation with the spin-polarized surface current in the film. Furthermore, we demonstrate the magnetization switching by scanning gate voltage with constant current and in-plane magnetic field applied in the film. The effective electric-field control of SOT and the giant spin-torque efficiency in Cr-doped TI may lead to the development of energy-efficient gate-controlled spin-torque devices compatible with modern field-effect semiconductor technologies. Comment: 22 pages, 4 figures |
| Databáze: | arXiv |
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