双轴铁磁体自旋力矩驱动磁化的开关时间
Switching time of spin-torque-driven magnetization in biaxial ferromagnets
摘要：
我们解析模型的双轴铁磁体驱动的反阻尼类自旋力矩的磁化翻转时间。的宏自旋磁化动力学映射到一个能量流方程，其中一个合理的函数近似的椭圆积分的适度的自旋电流和小阻尼的结果在一个封闭形式的表达的开关时间。初始磁化角的随机性给出了开关时间的分布函数。分析模型符合从蒙特卡罗模拟获得的结果为广泛的材料参数。我们的研究结果可以改善设计和基准的面内自旋矩磁存储器，避免昂贵的数值计算。
英文摘要：
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.
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