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arXiv 2005.03416cond-mat.mes-hall
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自旋转移矩作用下磁滴孤子产生和湮灭的热激活势垒

Thermal Activation Barriers for Creation and Annihilation of Magnetic Droplet Solitons in the Presence of Spin Transfer Torque

Gabriel D. Chaves-O'Flynn, Daniel L. Stein

摘要:

我们研究噪声诱导的磁液滴孤子的产生和湮灭的实验参数区域中,他们是线性稳定的漂移。利用旋转对称性的问题,我们转换到参考系与液滴孤子旋转,并引入一个有效的势能,占对自旋转移力矩旋转两个不同的方向之间的磁化所做的工作。我们使用这个函数来计算各种纳米接触半径和电流的均匀磁化状态和液滴孤子状态之间的两个方向上的激活势垒。研究了自旋矩非对称性参数为零和非零时液滴孤子的结构。我们的方法可以应用于估计激活障碍的动态系统中的非梯度项可以被吸收的变化的参考系,并建议一种技术适用于扩展系统,可能不均匀磁化。

英文摘要:

We study noise-induced creation and annihilation of magnetic droplet solitons in experimental parameter regions in which they are linearly stable against drift. Exploiting the rotational symmetry of the problem, we transform to the reference frame rotating with the droplet soliton and introduce an effective potential energy that accounts for the work done against spin-transfer torque to rotate the magnetization between two different orientations. We use this function to compute the activation barrier in both directions between the uniform magnetization state and the droplet soliton state for a variety of nanocontact radii and currents. We investigate droplet soliton structures with both zero and nonzero spin-torque asymmetry parameter. Our approach can be applied to estimate activation barriers for dynamical systems where non-gradient terms can be absorbed by changes of reference frames, and suggests a technique applicable to extended systems that may not be uniformly magnetized.

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