通过超高压透射电子显微镜实现电磁圆二色性的信号增强，用于定量纳米磁性测量。
Signal enhancement of electron magnetic circular dichroism by ultra-high-voltage TEM, toward quantitative nano-magnetism measurements.
作者信息
Tatsumi Kazuyoshi, Muto Shunsuke, Rusz Ján, Kudo Tomohiro, Arai Shigeo
机构信息
EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
EcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
出版信息
Microscopy (Oxf). 2014 Jun;63(3):243-7. doi: 10.1093/jmicro/dfu002. Epub 2014 Feb 5.
Electron magnetic circular dichroism (EMCD) has been known as the transmission electron microscopy (TEM) counterpart of X-ray magnetic circular dichroism (XMCD). XMCD is already widely used for the characterization of magnetic materials with synchrotron radiation. There have been common difficulties encountered in quantitative analysis of the EMCD signal measured by medium-voltage TEMs, such as a small signal fraction and the low signal-to-noise ratio of the EMCD signal. Theoretical calculations of EMCD considering many-beam dynamical diffraction effects showed improved net magnetic signal fractions at an accelerating voltage of 1 MV compared with 200 kV, which is in agreement with the present experiment.
电磁圆二色性（EMCD）一直被认为是X射线磁圆二色性（XMCD）在透射电子显微镜（TEM）方面的对应技术。XMCD已广泛用于利用同步辐射对磁性材料进行表征。在通过中压透射电镜测量的EMCD信号的定量分析中遇到了一些常见困难，例如EMCD信号的信号分数小和信噪比低。考虑多束动态衍射效应的EMCD理论计算表明，与200 kV相比，在1 MV的加速电压下净磁信号分数有所提高，这与当前实验结果一致。
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