Probing microwave fields and enabling in-situ experiments in a transmission electron microscope

Goncalves, F.J.T., Paterson, G.W. , McGrouther, D. , Drysdale, T., Togawa, Y., Schmool, D.S. and Stamps, R.L. (2017) Probing microwave fields and enabling in-situ experiments in a transmission electron microscope. Scientific Reports, 7, 11064. (doi:10.1038/s41598-017-11009-2) (PMID:28894134) (PMCID:PMC5593874)

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Abstract

A technique is presented whereby the performance of a microwave device is evaluated by mapping local field distributions using Lorentz transmission electron microscopy (L-TEM). We demonstrate the method by measuring the polarisation state of the electromagnetic fields produced by a microstrip waveguide as a function of its gigahertz operating frequency. The forward and backward propagating electromagnetic fields produced by the waveguide, in a specimen-free experiment, exert Lorentz forces on the propagating electron beam. Importantly, in addition to the mapping of dynamic fields, this novel method allows detection of effects of microwave fields on specimens, such as observing ferromagnetic materials at resonance.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McGrouther, Dr Damien and Togawa, Dr Yoshihiko and Stamps, Professor Robert and Paterson, Dr Gary
Authors: Goncalves, F.J.T., Paterson, G.W., McGrouther, D., Drysdale, T., Togawa, Y., Schmool, D.S., and Stamps, R.L.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Scientific Reports
Publisher:Nature Publishing Group
ISSN:2045-2322
ISSN (Online):2045-2322
Copyright Holders:Copyright © 2017 The Authors
First Published:First published in Scientific Reports 7:11064
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
683531Consortium for advanced materials based on spin chiralityRobert StampsEngineering and Physical Sciences Research Council (EPSRC)EP/M024423/1S&E P&A - PHYSICS & ASTRONOMY