Direct observation of the vortex core magnetization and its dynamics
Direct observation of the vortex core magnetization and its dynamics
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DOI：
10.1063/1.2738186
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发表时间：
2007-05-14
影响因子：
4
通讯作者：
Back, C. H.
中科院分区：
文献类型：
--
作者：
Chou, K. W.;Puzic, A.;Back, C. H.
利用扫描透射x射线显微镜研究了带有单磁涡的方形薄膜结构。本文报道了在500x500nm(2)、40nm厚的Ni-Fe软磁样品中直接观察到的涡旋核。在面内交变磁场的激励下，成像了涡旋核的静态形态以及涡旋核的回旋运动。这使他们能够直接看到涡旋核心的面外磁化方向（向上或向下）。地核的倒转是由交变磁场的短脉冲引起的。在地核的运动轨迹上，由于其方向分别指向上和下，呈现出一种不对称性。(C) 2007年美国物理研究所。
Square-shaped thin film structures with a single magnetic vortex were investigated using a scanning transmission x-ray microscope. The authors report on the direct observation of the vortex core in 500x500 nm(2), 40 nm thick soft magnetic Ni-Fe samples. The static configuration of the vortex core was imaged as well as the gyrotropic motion of the core under excitation with an in-plane alternating magnetic field. This enabled them to directly visualize the direction of the out-of-plane magnetization in the vortex core (up or down). The reversal of the core was effected by short bursts of an alternating magnetic field. An asymmetry appears in the core's trajectory for its orientation pointing up and down, respectively. (C) 2007 American Institute of Physics.