Nucleation and dynamics of magnetic vortices under spin-polarized current
Nucleation and dynamics of magnetic vortices under spin-polarized current
复制标题
DOI：
10.1103/physrevb.77.014439
复制
发表时间：
2008-01
影响因子：
3.7
通讯作者：
Y. Nakatani;J. Shibata;G. Tatara;H. Kohno;A. Thiaville;J. Miltat
中科院分区：
文献类型：
--
作者：
Y. Nakatani;J. Shibata;G. Tatara;H. Kohno;A. Thiaville;J. Miltat
铁磁体中的自旋极化电流会导致均匀磁化状态的不稳定性。在本文中，它是由微磁学模拟表明，在薄膜或宽导线，上述不稳定性之后形成的磁涡旋。随后的磁化动力学也研究了涡旋，其中包括对动力学和对湮灭。使用一个简单的分析模型，认为涡点，动力学的两个相互作用的涡下的电流进行分类，根据他们的涡度和极性。这很好地解释了模拟结果的基本特征。
Spin-polarized current in a ferromagnet is known to lead to the instability of the uniformly magnetized state. In this paper, it is demonstrated by micromagnetic simulations that, in films or wide wires, the above instability is followed by the formation of magnetic vortices. Subsequent magnetization dynamics is also studied in terms of vortices, which includes pair dynamics and pair annihilation. Using a simple analytical model that considers the vortices as points, the dynamics of two interacting vortices under the current is classified according to their vorticity and polarity. This explains well the essential features of the simulation results.