Detecting magnetic ordering with atomic size electron probes

被引：33

作者：

Idrobo, Juan Carlos ^{[1
]}

Rusz, Jan ^{[2
]}

Spiegelberg, Jakob ^{[2
]}

McGuire, Michael A. ^{[3
]}

Symons, Christopher T. ^{[4
]}

Vatsavai, Ranga Raju ^{[4
]}

Cantoni, Claudia ^{[3
]}

Lupini, Andrew R. ^{[3
]}

机构：

[1] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[2] Uppsala Univ, Dept Phys & Astron, POB 516, S-75120 Uppsala, Sweden

[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[4] Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN 37831 USA

来源：

ADVANCED STRUCTURAL AND CHEMICAL IMAGING | 2016年 / 2卷

基金：

瑞典研究理事会;

关键词：

Aberration correction; STEM; EELS; EMCD; Aberrated probes; Vortex beams;

D O I：

10.1186/s40679-016-0019-9

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

Although magnetism originates at the atomic scale, the existing spectroscopic techniques sensitive to magnetic signals only produce spectra with spatial resolution on a larger scale. However, recently, it has been theoretically argued that atomic size electron probes with customized phase distributions can detect magnetic circular dichroism. Here, we report a direct experimental real-space detection of magnetic circular dichroism in aberration-corrected scanning transmission electron microscopy (STEM). Using an atomic size-aberrated electron probe with a customized phase distribution, we reveal the checkerboard antiferromagnetic ordering of Mn moments in LaMnAsO by observing a dichroic signal in the Mn L-edge. The novel experimental setup presented here, which can easily be implemented in aberration-corrected STEM, opens new paths for probing dichroic signals in materials with unprecedented spatial resolution.

引用

页数：10

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