Tang Y-H, Kioussis Nicholas, Kalitsov Alan, Butler W H, Car Roberto
Department of Physics, California State University, Northridge, California 91330-8268, USA.
Phys Rev Lett. 2009 Jul 31;103(5):057206. doi: 10.1103/PhysRevLett.103.057206.
We predict an oscillatory bias behavior of the fieldlike spin torque, T(perpendicular), in magnetic tunnel junctions, which can be selectively controlled via the asymmetry in band filling between the ferromagnetic leads. This can lead to a linear or quadratic low-bias behavior, including tuning the bias-induced reversal of T(perpendicular). These findings reconcile the apparently contradictory experimental results recently reported in the literature. The underlying mechanism for the nonequilibrium interlayer exchange coupling (IEC) of noncollinear configurations is the interplay of four independent IEC for the majority- and minority-spin bands of the leads solely in the ferromagnetic configuration.
我们预测，磁隧道结中类场自旋扭矩T(垂直)存在振荡偏置行为，可通过铁磁引线之间能带填充的不对称性进行选择性控制。这会导致线性或二次低偏置行为，包括调整偏置诱导的T(垂直)反转。这些发现调和了文献中最近报道的明显相互矛盾的实验结果。非共线构型的非平衡层间交换耦合（IEC）的潜在机制是仅在铁磁构型中，引线的多数和少数自旋能带的四个独立IEC之间的相互作用。
