Parallel mode differential phase contrast in transmission electron microscopy, I: theory and analysis

Paterson, G. W. , Macauley, G. M. , McVitie, S. and Togawa, Y. (2021) Parallel mode differential phase contrast in transmission electron microscopy, I: theory and analysis. Microscopy and Microanalysis, 27(5), pp. 1113-1122. (doi: 10.1017/S1431927621012551)

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Abstract

In Part I of this diptych, we outline the parallel mode of differential phase contrast (TEM-DPC), which uses real-space distortion of Fresnel images arising from electrostatic or magnetostatic fields to quantify the phase gradient of samples with some degree of structural contrast. We present an analysis methodology and the associated software tools for the TEM-DPC method and, using them together with numerical simulations, compare the technique to the widely used method of phase recovery based on the transport-of-intensity equation (TIE), thereby highlighting the relative advantages and limitations of each. The TEM-DPC technique is particularly suitable for in situ studies of samples with significant structural contrast and, as such, complements the TIE method since structural contrast usually hinders the latter, but is an essential feature that enables the former. In Part II of this work, we apply the theory and methodology presented to the analysis of experimental data to gain insight into two-dimensional magnetic phase transitions.

Item Type:Articles
Additional Information:The authors acknowledge support from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom (Grant Number EP/M024423/1); Grants-in-Aid for Scientific Research on Innovative Areas “Quantum Liquid Crystals” (KAKENHI Grant No. JP19H05826) from JSPS of Japan; Grants-in-Aid for Scientific Research (KAKENHI Grant Nos. 17H02767 and 17H02923) from JSPS of Japan; and the Carnegie Trust for the Universities of Scotland.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Togawa, Dr Yoshihiko and Macauley, Mr Gavin and Paterson, Dr Gary and McVitie, Professor Stephen
Authors: Paterson, G. W., Macauley, G. M., McVitie, S., and Togawa, Y.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Microscopy and Microanalysis
Publisher:Cambridge University Press
ISSN:1431-9276
ISSN (Online):1435-8115
Published Online:20 September 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Microscopy and Microanalysis 27(5): 1113-1122
Publisher Policy:Reproduced under a Creative Commons License
Related URLs:
Data DOI:10.5525/gla.researchdata.1172

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190883Consortium for advanced materials based on spin chiralityStephen McVitieEngineering and Physical Sciences Research Council (EPSRC)EP/M024423/1P&S - Physics & Astronomy