电流驱动的磁性纳米带中的Skyrmion驱逐
Current-driven skyrmion expulsion from magnetic nanostrips
摘要：
我们利用微磁学模拟和解析计算研究了电流驱动下磁性纳米带中的skyrmion驱逐。我们探讨了Skyrmion驱逐的阈值电流密度，并表明，这个阈值是由临界边界力以及自旋力矩参数。我们还发现了临界边界力对磁性参数的依赖性;临界边界力随着交换刚度和垂直各向异性常数的增加而减小，而随着Dzyaloshinskiii-Moriya相互作用和饱和磁化强度常数的增加而增加。使用一个简单的模型描述的skyrmion和局部倾斜边缘磁化，我们揭示了潜在的物理的依赖性的临界边界力的磁参数的基础上缩放Dzyaloshinskiii-Moriya相互作用参数和临界边界力之间的关系。这项工作提供了一个基本的理解skyrmion驱逐和skyrmion和设备的边界之间的相互作用，并表明skyrmion在设备中的稳定性可以与缩放的Dzyaloshinskiii-Moriya磁性材料的相互作用参数。
英文摘要：
We study the current-driven skyrmion expulsion from magnetic nanostrips using micromagnetic simulations and analytic calculations. We explore the threshold current density for the skyrmion expulsion, and show that this threshold is determined by the critical boundary force as well as the spin-torque parameters. We also find the dependence of the critical boundary force on the magnetic parameters; the critical boundary force decreases with increasing the exchange stiffness and perpendicular anisotropy constants, while it increases with increasing Dzyaloshinskii-Moriya interaction and saturation magnetization constants. Using a simple model describing the skyrmion and locally-tilted edge magnetization, we reveal the underlying physics of the dependence of the critical boundary force on the magnetic parameters based on the relation between the scaled Dzyaloshinskii-Moriya-interaction parameter and the critical boundary force. This work provides a fundamental understanding of the skyrmion expulsion and the interaction between the skymion and boundaries of devices and shows that the stability of the skyrmion in devices can be related to the scaled Dzyaloshinskii-Moriya-interaction parameter of magnetic materials.
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