单扫描STEM-EMCD在3束方向使用四倍光圈使用
Hasan Ali1, Sharath Kumar Manjeshwar Sathyanath2, Cheuk-Wai Tai3
1Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden; Department of Materials Science and Engineering, Uppsala University, Box 534, 75121, Uppsala, Sweden.
Ultramicroscopy
|June 7, 2023
概括
对于电子磁循环二元化 (EMCD) 来说,获得多个电子能量损失光谱 (EELS) 是一个挑战. 这项研究引入了四倍的光圈,以在一次扫描中收集所有必要的EELS数据,简化了EMCD分析.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 电子显微镜电子显微镜
背景情况:
- 电子磁循环二元化 (EMCD) 需要多个角度解析的电子能量损失光谱 (EELS).
- 获取这些光谱需要多次扫描相同的样本区域,该区域容易因光束损伤,污染和漂移而产生错误.
- 扫描之间精确的空间注册对于准确的磁信息至关重要.
研究的目的:
- 开发一种新的方法,通过单个电子束扫描来获取EELS数据用于EMCD.
- 为了克服与EMCD实验中的多次扫描相关的挑战.
- 为了实现更精确,更可靠的局部磁力测量.
主要方法:
- 使用定制的四倍光圈,同时收集四个EELS光谱.
- 使用单次扫描中获得的数据进行了EMCD分析.
- 研究了以亚纳米尺寸的探针尺寸的定量EMCD结果,并比较了不同的探测器几何形状.
主要成果:
- 在单个电子束扫描中成功获得了用于EMCD分析的所有必要的EELS光谱.
- 消除了与空间注册和光束诱导的样本修改相关的复杂性.
- 对于亚纳米尺寸的探针尺寸,证明了EMCD定量结果.
结论:
- 定制的四倍光圈显著简化了EMCD实验.
- 这种单扫描方法提高了局部磁信息的准确性和可靠性.
- 该方法适用于需要精确光谱采集的先进电子显微镜技术.
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