论文标题
旋转涡旋振荡器的磁性能量的定量和现实描述
Quantitative and realistic description of the magnetic potential energy of spin-torque vortex oscillators
论文作者
论文摘要
了解磁性涡旋的动力学已成为最近旋转旋转涡旋振荡器的最新发展的重要挑战。微磁模拟或分析硫核方程方法通常用于理论上研究此类系统。这项工作着重于对涡流从平衡中移位时施加的恢复力的精确描述。特别是，研究了与磁性能项的修改有关的刚度参数。提出了一种从微磁模拟中提取交换，磁静力和Zeeman刚度表达式的方法。然后将这些表达式与最新的分析推导进行比较。此外，证明刚度参数不仅取决于涡流核心位置，还取决于注入的电流密度。这种现象不能通过常用的分析ansätze预测。我们表明，这些发现是由当前诱导的Ampère-Oersted场引起的理论磁纹理的变形引起的。
Understanding the dynamics of magnetic vortices has emerged as an important challenge regarding the recent development of spin-torque vortex oscillators. Either micromagnetic simulations or the analytical Thiele equation approach are typically used to study such systems theoretically. This work focuses on the precise description of the restoring forces exerted on the vortex when it is displaced from equilibrium. In particular, the stiffness parameters related to a modification of the magnetic potential energy terms are investigated. A method is proposed to extract exchange, magnetostatic and Zeeman stiffness expressions from micromagnetic simulations. These expressions are then compared to state-of-the-art analytical derivations. Furthermore, it is shown that the stiffness parameters depend not only on the vortex core position but also on the injected current density. This phenomenon is not predicted by commonly used analytical ansätze. We show that these findings result from a deformation of the theoretical magnetic texture caused by the current induced Ampère-Oersted field.
