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Bias-voltage dependence of perpendicular spin-transfer torque in asymmetric MgO-based magnetic tunnel junctions

Authors
Oh, Se-ChungPark, Seung-YoungManchon, AurelienChshiev, MairbekHan, Jae-HoLee, Hyun-WooLee, Jang-EunNam, Kyung-TaeJo, YounghunKong, Yo-ChanDieny, BernardLee, 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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