论文标题
垂直纳米磁体的自旋轨道扭矩切换的最佳协议
Optimal protocol for spin-orbit torque switching of a perpendicular nanomagnet
论文作者
论文摘要
通过最佳控制理论的方式证明，通过正确降低当前脉冲的两个平面成分，可以大大降低自旋轨道扭矩引起的纳米磁体的逆转。根据所需的逆转时间和材料特性，分析得出了最小化与焦耳加热相关的能源成本的最佳开关脉冲的时间依赖性。获得开关速度和能源效率之间的权衡的最佳反转时间。发现了旋转轨道扭矩的田间状和阻尼状组件之间的甜点平衡。它允许通过向下拨动的旋转电流脉冲进行特别有效的切换，该脉冲无需精确调整持续时间。
It is demonstrated by means of the optimal control theory that the energy cost of the spin-orbit torque induced reversal of a nanomagnet with perpendicular anisotropy can be strongly reduced by proper shaping of both in-plane components of the current pulse. The time-dependence of the optimal switching pulse that minimizes the energy cost associated with Joule heating is derived analytically in terms of the required reversal time and material properties. The optimal reversal time providing a tradeoff between the switching speed and energy efficiency is obtained. A sweet-spot balance between the field-like and damping-like components of the spin-orbit torque is discovered; it permits for a particularly efficient switching by a down-chirped rotating current pulse whose duration does not need to be adjusted precisely.
