Equilibrium magnetic states in individual hemispherical permalloy caps
Equilibrium magnetic states in individual hemispherical permalloy caps
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DOI：
10.1063/1.4756708
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发表时间：
2012-09-24
影响因子：
4
通讯作者：
Gaididei, Yuri
中科院分区：
文献类型：
--
作者：
Streubel, Robert;Kravchuk, Volodymyr P.;Gaididei, Yuri
研究了非磁性球形颗粒上单个软磁坡莫合金帽的磁化强度分布。我们实验可视化的磁性结构的分辨率限制的x射线磁圆二色性光电子发射显微镜（XMCD-PEEM）。通过分析XMCD-PEEM中所谓的尾部对比度，空间分辨率显着增强，这使我们能够探索磁涡旋及其在曲面上的位移。此外，帽状纳米结构被建模为挤压半球，以确定理论上的平衡磁状态的相图。计算的相图与实验结果符合得很好。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4756708]
The magnetization distributions in individual soft magnetic permalloy caps on non-magnetic spherical particles with sizes ranging from 50 to 800 nm are investigated. We experimentally visualize the magnetic structures at the resolution limit of the x-ray magnetic circular dichroism photoelectron emission microscopy (XMCD-PEEM). By analyzing the so-called tail contrast in XMCD-PEEM, the spatial resolution is significantly enhanced, which allowed us to explore magnetic vortices and their displacement on curved surfaces. Furthermore, cap nanostructures are modeled as extruded hemispheres to determine theoretically the phase diagram of equilibrium magnetic states. The calculated phase diagram agrees well with the experimental observations. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4756708]