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arXiv 1503.07681cond-mat.mtrl-sci
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用电子磁圆二色性定量分析氧化铁(110)表面的磁自旋和轨道矩

Quantitative analysis of magnetic spin and orbital moments from an oxidized iron (1 1 0) surface using electron magnetic circular dichroism

Thomas Thersleff, Jan Rusz, Stefano Rubino, Björgvin Hjörvarsson, Yasuo Ito, Nestor Zaluzec, Klaus Leifer

摘要:

了解降低晶体对称性对磁性行为的影响是提高我们对纳米尺度和界面磁性的理解的关键一步。然而,这种影响的调查往往是有争议的,主要是由于固有的挑战,直接关联纳米化学计量和结构的磁性行为。在这里,我们描述了如何使用透射电子显微镜(TEM),以获得作为散射角的函数的电磁圆二色性(EMCD)信号,以局部探测在Fe(1 1 0)表面上生长的薄氧化物层的磁性行为。实验和模拟都揭示了磁轨道与自旋比对其在倒易空间中的散射矢量的强烈依赖性。我们利用这种变化提取的氧化物包覆层的磁性,显示它局部可能表现出增强的轨道自旋矩比。这一发现得到了空间和角度分辨EMCD测量的支持,为研究纳米尺度特征对磁特性的影响开辟了道路。

英文摘要:

Understanding the ramifications of reduced crystalline symmetry on magnetic behavior is a critical step in improving our understanding of nanoscale and interfacial magnetism. However, investigations of such effects are often controversial largely due to the challenges inherent in directly correlating nanoscale stoichiometry and structure to magnetic behavior. Here, we describe how to use Transmission Electron Microscope (TEM) to obtain Electron Magnetic Circular Dichroism (EMCD) signals as a function of scattering angle to locally probe the magnetic behavior of thin oxide layers grown on an Fe (1 1 0) surface. Experiments and simulations both reveal a strong dependence of the magnetic orbital to spin ratio on its scattering vector in reciprocal space. We exploit this variation to extract the magnetic properties of the oxide cladding layer, showing that it locally may exhibit an enhanced orbital to spin moment ratio. This finding is supported here by both spatially and angularly resolved EMCD measurements, opening up the way for compelling investigations into how magnetic properties are affected by nanoscale features.

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