论文标题
磁对电子介导的自旋转移扭矩，由旋转电流穿过抗铁磁绝缘子，以切换相邻铁磁金属的磁化
Magnon versus electron mediated spin-transfer torque exerted by spin currents across antiferromagnetic insulator to switch magnetization of adjacent ferromagnetic metal
论文作者
论文摘要
最近的实验[Y. Wang et al., Science 366, 1125 (2019)] on magnon-mediated spin-transfer torque (MSTT) was interpreted in terms of a picture where magnons are excited within an antiferromagnetic insulator (AFI), by applying nonequilibrium electronic spin density at one of its surfaces, so that their propagation across AFI deprived of conduction electrons eventually leads to reversal of magnetization of a铁磁金属（FM）附着在AFI的相对表面上。我们采用了最近开发的时间依赖性的非平衡绿色功能，结合了Landau-lifshitz-gilbert方程（TDNEGF+LLG）形式主义，以在机电上进化传导电子量子，而它们通过与局部的磁性磁力相互作用，通过与原子旋转动力学求解llg e llg equalding llgg equains os llgg equains ossections量相互作用。将平方电流脉冲注入初始条件后，FM极光器/AFI/FM-ANALYZER的TDNEGF+LLG模拟表明，FM-Analyzer内局部磁矩的逆转效率较低，在需要更大的脉冲高度及其更长的持续时间（比常规电子介导的Stt（estt）驾驶Magnets switchting switcht switchting switcht switcht switching switching switching switching switching switching switching switching， FM偏振器/正常金属/FM-Analyzer自旋阀。由于通过AFI的自旋泵送以及由AFI直接传输产生的磁性泵产生的电子，因此将自旋电流注入到FM-Analyzer中，因此其局部磁矩将经历MSTT和ESTT的组合。然而，通过人为地关闭ESTT，我们证明了MSTT起着主要的作用，因此，他的理解为全麦农驱动的磁化开关设备铺平了道路，没有电子零件。
The recent experiment [Y. Wang et al., Science 366, 1125 (2019)] on magnon-mediated spin-transfer torque (MSTT) was interpreted in terms of a picture where magnons are excited within an antiferromagnetic insulator (AFI), by applying nonequilibrium electronic spin density at one of its surfaces, so that their propagation across AFI deprived of conduction electrons eventually leads to reversal of magnetization of a ferromagnetic metal (FM) attached to the opposite surface of AFI. We employ a recently developed time-dependent nonequilibrium Green functions combined with the Landau-Lifshitz-Gilbert equation (TDNEGF+LLG) formalism to evolve conduction electrons quantum-mechanically while they interact via self-consistent back-action with localized magnetic moments described classically by atomistic spin dynamics solving a system of LLG equations. Upon injection of square current pulse as the initial condition, TDNEGF+LLG simulations of FM-polarizer/AFI/FM-analyzer junctions show that reversal of localized magnetic moments within FM-analyzer is less efficient, in the sense of requiring larger pulse height and its longer duration, than conventional electron-mediated STT (ESTT) driving magnetization switching in standard FM-polarizer/normal-metal/FM-analyzer spin valve. Since both electronic, generated by spin pumping from AFI, and magnonic, generated by direct transmission from AFI, spin currents are injected into the FM-analyzer, its localized magnetic moments will experience combined MSTT and ESTT. Nevertheless, by artificially turning off ESTT we demonstrate that MSTT plays a dominant role whose understanding, therefore, paves the way for all-magnon-driven magnetization switching devices with no electronic parts.
