论文标题
在存在自旋转移扭矩的情况下，创建和an灭磁液滴的热激活屏障
Thermal Activation Barriers for Creation and Annihilation of Magnetic Droplet Solitons in the Presence of Spin Transfer Torque
论文作者
论文摘要
我们研究了在实验参数区域中噪声诱导的磁液滴孤子的创造和an灭，其中它们与漂移线性稳定。利用问题的旋转对称性，我们转换为用液滴索尼顿旋转的参考框架，并引入了有效的势能，该能量解释了针对自旋转移扭矩所做的工作，以旋转两个不同方向之间的磁化。我们使用此功能来计算均匀磁化状态和液滴孤子状态之间的两个方向的激活屏障，以用于各种纳米接地半径和电流。我们研究了零和非旋转旋转不对称参数的液滴孤子结构。我们的方法可以应用于动态系统的估计激活障碍，在这些系统中，非梯度项可以被参考帧的变化吸收，并提出一种适用于扩展系统的技术，该技术可能不会均匀地磁化。
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.
