Bias-voltage dependence of perpendicular spin-transfer torque in asymmetric MgO-based magnetic tunnel junctions
- Authors
- Oh, Se-Chung; Park, Seung-Young; Manchon, Aurelien; Chshiev, Mairbek; Han, Jae-Ho; Lee, Hyun-Woo; Lee, Jang-Eun; Nam, Kyung-Tae; Jo, Younghun; Kong, Yo-Chan; Dieny, Bernard; Lee, Kyung-Jin
- Issue Date
- Dec-2009
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE PHYSICS, v.5, no.12, pp.898 - 902
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE PHYSICS
- Volume
- 5
- Number
- 12
- Start Page
- 898
- End Page
- 902
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/118798
- DOI
- 10.1038/NPHYS1427
- ISSN
- 1745-2473
- Abstract
- Spin-transfer torque(1,2) (STT) allows the electrical control of magnetic states in nanostructures(3-5). The STT in magnetic tunnel junctions (MTJs) is of particular importance owing to its potential for device applications(6,7). It has been demonstrated(8-11) that the MTJ has a sizable perpendicular STT (tau(perpendicular to), field-like torque), which substantially affects STT-driven magnetization dynamics. In contrast to symmetric MTJs where the bias dependence of tau(perpendicular to) is quadratic(8-10,12,13), it is theoretically predicted that the symmetry breaking of the system causes an extra linear bias dependence(11). Here, we report experimental results that are consistent with the predicted linear bias dependence in asymmetric MTJs. The linear contribution is quite significant and its sign changes from positive to negative as the asymmetry is modified. This result opens a way to design the bias dependence of the field-like term, which is useful for device applications by allowing, in particular, the suppression of the abnormal switching-back phenomena.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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