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- W2595160285 abstract "The phenomenon of spin transfer torque (STT) has attracted a great deal of interest due to its promising prospects in practical spintronic devices. In this paper, we report a theoretical investigation of STT in a noncollinear magnetic tunnel junction under ac modulation based on the nonequilibrium Green's-function formalism, and we derive a closed formulation for predicting the time-averaged STT. Using this formulation, the ac STT of a carbon-nanotube-based magnetic tunnel junction is analyzed. Under ac modulation, the low-bias linear (quadratic) dependence of the in-plane (out-of-plane) torque on bias still holds, and the $sinensuremath{theta}$ dependence on the noncollinear angle is maintained. By photon-assisted tunneling, the bias-induced components of the in-plane and out-of-plane torques can be enhanced significantly, about 12 and 75 times, respectively. Our analysis reveals the condition for achieving optimized STT enhancement and suggests that ac modulation is a very effective way for electrical manipulation of STT." @default.
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- W2595160285 date "2017-03-13" @default.
- W2595160285 modified "2023-10-17" @default.
- W2595160285 title "Enhancing the spin transfer torque in magnetic tunnel junctions by ac modulation" @default.
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- W2595160285 doi "https://doi.org/10.1103/physrevb.95.115417" @default.
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