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软磁Ni₈₀Fe₂₀薄膜单元中磁涡旋结构的高分辨磁力显微观察

High resolution magnetic force microscopy observation of magnetic vortex structure in soft magnetic Ni₈₀Fe₂₀ thin film elements

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【Author】 ZHONG Hai~(1,2*),HUANG Lei~3,WANG Su-mei~1,WEI Dan~1,YUAN Jun~(2,4*),ZHU Yi-mei~3(1.Department of Materials Science and Engineering,Tsinghua University,2.Beijing National Center for Electron Microscopy,Tsinghua University,Beijing 100084;3.Department of Condensed Matter Physics and Material Science,Brookhaven National Laboratory,Upton,New York 11973,USA;4.Department of Physics,University of York,Heslington,York YO10 5DD,UK)

【机构】清华大学材料科学与工程系；清华大学北京国家电子显微镜中心； Department of Condensed Matter Physics and Material Science,Brookhaven National Laboratory； Department of Physics,University of York；

【摘要】本文利用高分辨磁力显微技术对Ni80Fe20薄膜单元进行了直接观察,发现在双圆盘"花生形"单元中存在磁涡旋结构,并能够清晰地看到单元中心附近或亮或暗的涡旋核。实验结果表明,在包括针尖卷积效应的情况下,磁涡旋核中心轮廓线的直接测量宽度约为40 nm,这个分辨率远高于迄今为止报道的关于磁涡旋结构的MFM测量结果。更多还原

【Abstract】 The high resolution magnetic force microscopy（MFM） was used to directly observe the Ni₈₀Fe₂₀ thin film elements.It is shown that the magnetic vortex structure appears in the remnant states of the two-disk peanut shaped elements.The vortex core with either a bright spotty contrast or a dark spotty contrast can be directly observed near the center of the element.The line profiles though the vortex core center show that the diameter of the vortex core is about 40 nm even with the convolution of the finite size of the tip apex,which is to date the highest resolution achieved in MFM for the magnetic vortex studies.更多还原