Journal
ULTRAMICROSCOPY
Volume 120, Issue -, Pages 78-85Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2012.06.011
Keywords
Phase plate; Thin-film rings; Vortex state; Aharonov-Bohm effect
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Funding
- Royal Society
- Hitachi Europe Ltd.
- Thin Film Magnetism group of C.U. Department of Physics
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Holographic measurements on magnetised thin-film cobalt rings have demonstrated both onion and vortex states of magnetisation. For a ring in the vortex state, the difference between phases of electron paths that pass through the ring and those that travel outside it was found to agree very well with Aharonov-Bohm theory within measurement error. Thus the magnetic flux in thin-film rings of ferromagnetic material can provide the phase shift required for phase plates in transmission electron microscopy. When a ring of this type is used as a phase plate, scattered electrons will be intercepted over a radial range similar to the ring width. A cobalt ring of thickness 20nm can produce a phase difference of pi/2 from a width of just under 30nm, suggesting that the range of radial interception for this type of phase plate can be correspondingly small. (C) 2012 Elsevier B.V. All rights reserved.
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