Behera Sushant Kumar, Deb Pritam
Advanced Functional Material Laboratory (AFML), Department of Physics, Tezpur University (Central University), Tezpur-784028, India.
Phys Chem Chem Phys. 2020 Sep 14;22(34):19139-19146. doi: 10.1039/d0cp00836b. Epub 2020 Aug 19.
Spin-transfer-torque mediated quantum magnetotransport behaviour can be realized via magnetization density switching in 2D van der Waals heterostructures for device applications. In this context, time-dependent spin-current controls the spin-transfer-torque behaviour within a density functional theory simulation supported by Green's function. Here, magnetotransport characteristics have been revealed in a model semiconducting MoS/phosphorene van der Waals heterostructure at the nanoscale. We study the dynamics of spin-current channelized heterojunction transport with rotational variation in the magnetization angle. It is observed that the time-varying spin-transfer-torque remains invariant irrespective of the magnetization angle direction. Meanwhile, the polarized spin-current shows a persistent damped oscillatory behavior with the oscillation frequency proportional to the applied external magnetic field. This oscillating behavior shows a transient spin-transfer-torque with close proximity to the steady-state value. These findings support the existence of active interfacial resonant states for spintronic device applications.
自旋转移力矩介导的量子磁输运行为可通过二维范德华异质结构中的磁化密度切换来实现，以用于器件应用。在此背景下，在格林函数支持的密度泛函理论模拟中，随时间变化的自旋电流控制着自旋转移力矩行为。在此，已在纳米尺度的模型半导体MoS/磷烯范德华异质结构中揭示了磁输运特性。我们研究了随着磁化角的旋转变化，自旋电流通道化异质结输运的动力学。观察到，时变自旋转移力矩与磁化角方向无关，保持不变。同时，极化自旋电流呈现持续的阻尼振荡行为，振荡频率与所施加的外部磁场成正比。这种振荡行为显示出与稳态值接近的瞬态自旋转移力矩。这些发现支持了用于自旋电子器件应用的有源界面共振态的存在。
