论文标题
各向异性超快旋转动力学
Anisotropic Ultrafast Spin Dynamics in Epitaxial Cobalt
论文作者
论文摘要
我们研究了外延HCP（1100）钴薄膜中的超快自旋动力学。通过沿轻松或硬磁轴进行磁化测量，我们确定了两个轴的磁反应和恢复时间。我们观察到沿易于磁化轴的动力学速度慢35％，我们将其归因于电子 - 音波耦合的磁晶体轴，并由我们的从头算计算支持。这表明在超快磁性中，各向异性电子晶格耦合的明确且以前未公开的作用。
We investigate the ultrafast spin dynamics in an epitaxial hcp(1100) cobalt thin film. By performing pump-probe magneto-optical measurements with the magnetization along either the easy or hard magnetic axis, we determine the demagnetization and recovery times for the two axes. We observe a 35% slower dynamics along the easy magnetization axis, which we attribute to magneto-crystalline anisotropy of the electron-phonon coupling, supported by our ab initio calculations. This points towards an unambiguous and previously undisclosed role of anisotropic electron-lattice coupling in ultrafast magnetism.
