Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-03-12
Phys. Lett. A306, 249 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Revtex, 11 papes, 4 figures, appendix
Scientific paper
10.1016/S0375-9601(02)01597-9
We have investigated the current-induced spin transfer torque of a ferromagnet-insulator-ferromagnet tunnel junction by taking the spin-flip scatterings into account. It is found that the spin-flip scattering can induce an additional spin torque, enhancing the maximum of the spin torque and giving rise to an angular shift compared to the case when the spin-flip scatterings are neglected. The effects of the molecular fields of the left and right ferromagnets on the spin torque are also studied. It is found that $\tau ^{Rx}/I_{e}$ ($\tau ^{Rx}$ is the spin-transfer torque acting on the right ferromagnet and $I_{e}$ is the tunneling elcetrical current) does vary with the molecular fields. At two certain angles, $\tau ^{Rx}/I_{e}$ is independent of the molecular field of the right ferromagnet, resulting in two crossing points in the curve of $\tau ^{Rx}/I_{e}$ versus the relevant orientation for different molecular fields.
Jin Biao
Su Gang
Zheng Qing-Rong
Zhu Zhen-Gang
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