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	Author	Guzzinati, G.; Béché, A.; McGrouther, D.; Verbeeck, J.
	Title	Prospects for out-of-plane magnetic field measurements through interference of electron vortex modes in the TEM			Type	A1 Journal article
	Year	2019	Publication	Journal of optics	Abbreviated Journal	J Optics-Uk
	Volume	21	Issue	12	Pages	124002
	Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
	Abstract	Magnetic field mapping in transmission electron microscopy is commonplace, but all conventional methods provide only a projection of the components of the magnetic induction perpendicular to the electron trajectory. Recent experimental advances with electron vortices have shown that it is possible to map the out of plane magnetic induction in a TEM setup via interferometry with a specifically prepared electron vortex state carrying high orbital angular momentum (OAM). The method relies on the Aharonov?Bohm phase shift that the electron undergoes when going through a longitudinal field. Here we show how the same effect naturally occurs for any electron wave function, which can always be described as a superposition of OAM modes. This leads to a clear connection between the occurrence of high-OAM partial waves and the amount of azimuthal rotation in the far field angular distribution of the beam. We show that out of plane magnetic field measurement can thus be obtained with a much simpler setup consisting of a ring-like aperture with azimuthal spokes. We demonstrate the experimental setup and explore the achievable sensitivity of the magnetic field measurement.
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	Corporate Author				Thesis
	Publisher		Place of Publication		Editor
	Language		Wos	000499367800001	Publication Date	2019-10-28
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	2040-8978	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
	Impact Factor	1.741	Times cited	3	Open Access
	Notes	The authors thank V Grillo and T Harvey for interesting and fruitful discussion. GG acknowledges support from a postdoctoral fellow-ship grant from the Fonds Wetenschappelijk Onderzoek – Vlaanderen (FWO). The Qu-Ant-EM microscope was partly funded by the Hercules fund from the Flemish Government. This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 823717 – ESTEEM3. AB acknowledges funding from FWO project G093417N ('Compressed sensing enabling low dose imaging in transmission electron microscopy'). DM gratefully acknowledges funding of the FEBID capability through joint funding by University of Glasgow & EPSRC through a Strategic Equipment Grant (EP/P001483/1).			Approved	Most recent IF: 1.741
	Call Number	UA @ admin @ c:irua:165116			Serial	6319
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