Signal enhancement of electron magnetic circular dichroism by ultra-high-voltage TEM, toward quantitative nano-magnetism measurements
Signal enhancement of electron magnetic circular dichroism by ultra-high-voltage TEM, toward quantitative nano-magnetism measurements
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DOI：
10.1093/jmicro/dfu002
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发表时间：
2014-06-01
期刊：
影响因子：
1.8
通讯作者：
Arai, Shigeo
中科院分区：
文献类型：
--
作者：
Tatsumi, Kazuyoshi;Muto, Shunsuke;Arai, Shigeo
电子磁性圆二色性（EMCD）被称为x射线磁性圆二色性（XMCD）的透射电子显微镜（TEM）对应体。XMCD已广泛应用于同步辐射磁性材料的表征。在对中压tem测量的EMCD信号进行定量分析时，经常遇到一些困难，例如信号分量小，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，1 MV加速电压下的净磁信号分数有所提高，这与本实验结果一致。
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.