Institut für Theoretische Physik, Universität Hamburg, Germany.
Phys Rev Lett. 2010 Oct 22;105(17):177201. doi: 10.1103/PhysRevLett.105.177201. Epub 2010 Oct 18.
We analytically determine the spatially varying spin-transfer torque within a domain wall. In the case of ballistic spin and diffusive charge transport, the spin-transfer torque as well as the local degree of nonadiabaticity oscillate within a domain wall. In narrow domain walls, the degree of nonadiabaticity ceases to be a constant material parameter but depends on the domain-wall width including a possible sign change, which is crucial for experiments and the technological utilization in spin-transfer-torque-based storage devices.
我们分析确定了畴壁内空间变化的自旋转移力矩。在弹道自旋和扩散电荷输运的情况下，自旋转移力矩以及局部非绝热度在畴壁内振荡。在窄的畴壁中，非绝热度不再是一个恒定的材料参数，而是取决于畴壁宽度，包括可能的符号变化，这对于实验和基于自旋转移力矩的存储器件的技术应用至关重要。
