Magnetic imaging with a Zernike-type phase plate in a transmission electron microscope

Pollard, Shawn; Malac, Marek; Beleggia, Marco; Kawasaki, Masahiro; Zhu, Yimei
May 2013
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p192401
Academic Journal
We demonstrate the use of a hole-free phase plate (HFPP) for magnetic imaging in transmission electron microscopy by mapping the domain structure in PrDyFeB samples. The HFPP, a Zernike-like imaging method, allows for detecting magnetic signals in-focus to correlate the sample crystal structure and defects with the local magnetization topography, and to evidence stray fields protruding from the sample. Experimental and simulated results are shown and are compared with conventional Fresnel (out-of-focus) images without a phase plate. A key advantage of HFPP imaging is that the technique is free from the reference wave distortion from long-range fields affecting electron holography.


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