TEM imaging and application of thin-film magnetic rings for phase plates

Electron Microscopy and Analysis Group Conference 2013

Edgcombe, C.J.^1 ; Loudon, J.C.^2

TFMM Group, Department of Physics, University of Cambridge, CB3 0HE, United Kingdom^1

Electron Microscopy Group, Department of Materials Science, University of Cambridge, CB3 0FS, United Kingdom^2

关键词: Effective focal lengths;    Low-spatial frequency;    Magnetic rings;    Objective lens;    Out-of plane;    Phase object;    Zernike phase;    Zernike plates;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/522/1/012047/pdf
DOI  :  10.1088/1742-6596/522/1/012047

来源: IOP

【 摘 要 】

The maximum out-of-plane field that some thin-film cobalt rings resisted while remaining in the vortex state was found experimentally to be lower than expected from simulation, possibly due to tilt. Analysis of a Zernike phase plate shows that the observed bright outlines around large objects result from the low-spatial-frequency limit of correction imposed by the beam hole. The maximum size of phase object that can be imaged accurately with a Zernike plate can be raised by increasing the effective focal length of the objective lens.