AI 中文总结
研究铁磁纳米线中磁畴壁动力学，用随机朗道 - 里夫希茨 - 吉尔伯特方程，分析激光温度等因素对DW速度的影响，发现激光宽度和到DW距离可独立控制DW响应，有助于阐明热驱动机制及指导自旋电子存储器件热控策略。
AI 中文摘要
我们使用随机朗道 - 里夫希茨 - 吉尔伯特方程研究了在激光光斑的局部高斯温度分布下，单轴铁磁纳米线中的磁畴壁（DW）动力学。DW速度随激光峰值温度线性增加，随激光到DW距离增加而减小。速度随吉尔伯特阻尼非线性变化，因为阻尼增强了热磁振子激发但缩短了磁振子传播长度。DW最初远离激光加热区域，其位置的温度梯度有效为零且熵转矩可忽略不计，因此DW运动主要由磁振子自旋转移转矩驱动。我们分析了激光温度、激光到DW距离、阻尼、单轴各向异性和激光宽度。分析表明激光宽度和激光到DW距离独立控制DW响应。这些发现可能阐明局部热驱动DW运动的机制，并指导自旋电子赛道存储器件中的热控制策略。
英文摘要
We investigate magnetic domain wall (DW) dynamics in a uniaxial ferromagnetic nanowire under the localized Gaussian temperature profile of a laser spot using the stochastic Landau-Lifshitz-Gilbert equation. The DW velocity increases linearly with peak laser temperature and decreases with increasing laser to DW distance. The velocity varies nonlinearly with Gilbert damping because damping strengthens thermal magnon excitation but shortens the magnon propagation length. The DW initially lies away from the laser-heated region, so the temperature gradient at its position is effectively zero and the entropic torque is negligible. The DW motion is therefore mainly driven by magnonic spin-transfer torque. We analyze laser temperature, laser to DW distance, damping, uniaxial anisotropy, and laser width. The analysis shows that laser width and laser to DW distance independently control the DW response. These findings may clarify the mechanism of localized thermally driven DW motion and guide thermal control strategies in spintronic racetrack-memory devices.
