Magnetic vortex core observation in circular dots of permalloy
Magnetic vortex core observation in circular dots of permalloy
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DOI：
10.1126/science.289.5481.930
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发表时间：
2000-08-11
期刊：
影响因子：
56.9
通讯作者：
Ono, T
中科院分区：
文献类型：
--
作者：
Shinjo, T;Okuno, T;Ono, T
纳米尺度磁点的自旋结构是越来越多的科学努力的主题，因为几何限制对自旋的限制使这些结构可以与磁铁的某些内部特征长度尺度相媲美。对于涡旋(具有卷曲磁结构的铁磁点)，理论上预测在涡旋中心存在一个垂直磁化点。磁力显微镜对坡莫合金(Ni80Fe20)直径0.3到1微米、厚50纳米的圆点进行成像，提供了这个磁化点的实验证据。
Spin structures of nanoscale magnetic dots are the subject of increasing scientific effort, as the confinement of spins imposed by the geometrical restrictions makes these structures comparable to some internal characteristic Length scales of the magnet. For a vortex (a ferromagnetic dot with a curling magnetic structure), a spot of perpendicular magnetization has been theoretically predicted to exist at the center of the vortex. Experimental evidence for this magnetization spot is provided by magnetic force microscopy imaging of circular dots of permalloy (Ni80Fe20) 0.3 to 1 micrometer in diameter and 50 nanometers thick.