论文标题
双轴铁磁体中自旋扭转驱动磁化的切换时间
Switching time of spin-torque-driven magnetization in biaxial ferromagnets
论文作者
论文摘要
我们通过分析对由抗体样旋转扭矩驱动的双轴铁磁体的磁化切换时间进行建模。宏平磁磁化动力学映射到能量流程方程，其中中等自旋电流和小型阻尼的椭圆形积分的有理函数近似导致切换时间的封闭形式表达。磁化的初始角度的随机性给出了切换时间的分布函数。分析模型符合从蒙特卡洛模拟获得的结果广泛材料参数的结果。我们的结果可以通过避免昂贵的数值计算来改善面内自旋扭矩磁性内存的设计和基准测试。
We analytically model the magnetization switching time of a biaxial ferromagnet driven by an antidamping-like spin torque. The macrospin magnetization dynamics is mapped to an energy-flow equation, wherein a rational-function approximation of the elliptic integrals for moderate spin current and small damping results in a closed-form expression of the switching time. Randomness in the initial angle of magnetization gives the distribution function of the switching time. The analytic model conforms to the results obtained from Monte Carlo simulation for a broad range of material parameters. Our results can ameliorate design and benchmarking of in-plane spin torque magnetic memory by obviating expensive numerical computation.
