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In-Line Holography and Phase Amplification for Quantitative Phasecoherent Foucault Imaging

Published online by Cambridge University Press:  02 July 2020

V.V. Volkov  and
Y. Zhu
V.V. Volkov
Affiliation:
Department of Applied Science, Brookhaven National Laboratory, Upton, NY11973
Y. Zhu
Affiliation:
Department of Applied Science, Brookhaven National Laboratory, Upton, NY11973
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Extract

For magnetic flux mapping in magnetic materials it is important to use a simple, reliable and quantitative method operating with resolution down to few nanometers scale. The traditional off-axes electron holography can reach, in principle, such a resolution. However, the time-consuming phase reconstruction procedure limits its applications to real-time dynamic studies of magnetic domains behavior under varied external field. A novel recently developed in-line holographic approach, based on magnetic interferograms generated by phase-coherent Foucault (PCF)-imaging, complies with most of these demands and is suitable for dynamic studies of domain structure. For instance, it was successfully applied for induction mapping of closure domains in soft Fe-films [1]. It was found, however, that the resolution of PCF-imaging was lower than that of off-axis electron holography, since it is limited by the observed fringe spacing [2].

We report that the real resolution of PCF-imaging can be improved significantly with help of a novel phase amplification method.

Type
Image Simulation and Image Processing Techniques
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 1034 - 1035
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Johnston, A.B., Chapman, J.N., Journal of Microscopy, Vol.179, Pt.2 (1995) 119–128.CrossRefGoogle Scholar
2.Hubert, A., Schafer, R., “Magnetic domains”, Springer 1998, p.63.Google Scholar
3.Tonomura, A., Surf. Sci. Rep., 20, 317 (1994).CrossRefGoogle Scholar