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在TEM中通过精确的二维厚度测定进行定量磁图绘制.

Joseph Vimal Vas1, Hasan Ali2, Wen Shi1

  • 1Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, Jülich, 52425, Germany.

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概括

使用电子能量损失光谱 (EELS) 精确的厚度测量对于使用传输电子显微镜 (TEM) 进行定量磁图绘制至关重要. 本研究提出了一种方法来精确确定非弹性平均自由路径 (λ),以提高EELS的准确性.

关键词:
收束电子 difraktion 电子 difraktion 收束电子 difraktion 电子 difraktion 电子 difraktion 电子 difraktion 电子 difraktion 电子 difraktion 电子 difraktion 电子 difraktion 电子 difraktion 电子 difraktion 电子 difraktion电子能量损失光谱学 电子能量损失光谱学电子全息学电子全息学电子磁性圆形二元化是电子磁性圆形二元化.聚焦的离子束.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 物理 物理学 物理
  • 电子显微镜电子显微镜

背景情况:

  • 离轴电子全息学和电子磁循环二元化 (EMCD) 提供高空间分辨率的磁图绘制.
  • 定量磁性测量的当前局限性源于不精确的样品厚度确定.
  • 电子能量损失光谱 (EELS) 是厚度映射的一个有希望的技术,但需要准确的不弹性平均自由路径 (λ) 估计.

研究的目的:

  • 开发一种简单的方法,精确地确定非弹性平均自由路径 (λ).
  • 为了使精确的厚度测量使用EELS进行定量磁性分析.
  • 将EELS衍生的厚度测量与已建立的方法比较,例如融合束电子衍射 (CBED) 和扫描电子显微镜 (SEM).

主要方法:

  • 确定非弹性平均自由路径 (λ) 以准确的基于EELS的厚度测量.
  • 获取EELS地图以评估空间厚度变化.
  • 将EELS厚度数据与CBED和SEM测量进行比较,特别是在薄样本 (<100nm) 中.
  • 将校准厚度测量应用到基于TEM的磁图绘制技术.

主要成果:

  • 建立了一个简单的方法来精确地确定无弹性平均自由路径 (λ).
  • 使用EELS.生成了准确的厚度图.
  • 在EELS和CBED/SEM厚度测量之间观察到差异,特别是在薄于100nm的样品中.
  • 通过整合校准的EELS厚度数据,成功获得了定量磁图.

结论:

  • 精确确定非弹性平均自由路径 (λ) 显著提高了EELS用于厚度测量的定量能力.
  • 使用EELS精确的厚度映射对于改进通过先进的传输电子显微镜 (TEM) 技术获得的磁性信息的量化至关重要.
  • 开发的方法为材料科学中更可靠的定量磁性成像提供了一条途径.