Electron holography is used to visualize the electromagnetic field inside and outside a sample with high resolution. However, for analysis of nanocrystalline materials, difficulties related to electron diffraction are expected to arise due to the random orientation of the nanocrystallites. Here we present a procedure to extract magnetic field information from holograms and reduce the effect of electron diffraction by paying attention to the contrast of bright-field images. As a demonstration, the difference in the intensity of the magnetic flux between the Fe-Si-B-P-Cu amorphous matrix and Fe-rich body-centered cubic (bcc) nanocrystallites is detected with this procedure.

电子全息术用于以高分辨率可视化样品内部和外部的电磁场。然而，对于纳米晶材料的分析，由于纳米晶的随机取向，预计会出现与电子衍射相关的困难。在这里，我们提出了一种从全息图中提取磁场信息的过程，并通过注意明场图像的对比度来减少电子衍射的影响。作为演示，通过该程序检测了 Fe-Si-BP-Cu 非晶基体和富含 Fe 的体心立方 (bcc) 纳米微晶之间磁通量强度的差异。