论文标题
用于抗铁磁域壁的自旋转移扭矩的数值计算
Numerical Computation of Spin-Transfer Torques for Antiferromagnetic Domain walls
论文作者
论文摘要
我们基于紧密结合模型中的线性响应理论，计算出电流诱导的抗磁性域壁的电流诱导的自旋转移扭矩。我们发现，与铁磁结构域壁运动不同，绝热旋转扭矩对抗铁磁结构域壁运动的贡献可以忽略不计，这与以前的理论一致。结果，非绝热自旋转移扭矩是用于抗铁磁域壁运动的主要驱动扭矩。此外，用于较窄的抗铁磁结构域壁的非绝热自旋转移扭矩比铁电磁域壁的增加更快，这归因于抗铁磁域壁增强的旋转误导过程。
We numerically compute current-induced spin-transfer torques for antiferromagnetic domain walls, based on a linear response theory in a tight-binding model. We find that, unlike for ferromagnetic domain wall motion, the contribution of adiabatic spin torque to antiferromagnetic domain wall motion is negligible, consistent with previous theories. As a result, the non-adiabatic spin-transfer torque is a main driving torque for antiferromagnetic domain wall motion. Moreover, the non-adiabatic spin-transfer torque for narrower antiferromagnetic domain walls increases more rapidly than that for ferromagnetic domain walls, which is attributed to the enhanced spin mistracking process for antiferromagnetic domain walls.
