旋转磁场中的极化选择性磁涡旋动力学和核反转
Polarisation selective magnetic vortex dynamics and core reversal in rotating magnetic fields
摘要：
一个磁涡流发生在微米和亚微米尺寸的薄铁磁血小板的平衡配置，其特征在于由平面内卷曲磁化。在中心处，通过平面外磁化核心来避免磁奇点。该核心具有回转激励模式，其对应于涡旋围绕其平衡位置的圆形运动，其中旋转方向由涡旋核心磁化的方向、其极化确定。与激发两种偏振态的线性场或自旋极化电流不同，面内旋转场可以选择性地激发其中一种偏振态。在这里，我们报告的观察响应旋转磁场的涡旋动力学，成像与时间分辨扫描X射线显微镜。我们证明，旋转场只激发gyrotropic模式，如果该领域的旋转方向与涡的回转方向相一致，这样的字段可以选择性地扭转涡的偏振。
英文摘要：
A magnetic vortex occurs as an equilibrium configuration in thin ferromagnetic platelets of micron and sub-micron size and is characterised by an in-plane curling magnetisation. At the centre, a magnetic singularity is avoided by an out-of-plane magnetisation core. This core has a gyrotropic excitation mode, which corresponds to a circular motion of the vortex around its equilibrium position, where the rotation sense is determined by the direction of the vortex core magnetisation, its polarisation. Unlike linear fields or spin polarised currents, which excite both polarisation states, an in-plane rotating field can selectively excite one of the polarisation states. Here we report the observation of vortex dynamics in response to rotating magnetic fields, imaged with time-resolved scanning X-ray microscopy. We demonstrate that the rotating field only excites the gyrotropic mode if the rotation sense of the field coincides with the vortex gyration sense and that such a field can selectively reverse the vortex polarisation.
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