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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Beleggia, Marco
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2019Optical property – composition correlation in noble metal alloy nanoparticles studied with EELScitations
- 2018Charging of carbon thin films in scanning and phase-plate transmission electron microscopycitations
- 2017The substrate effect in electron energy-loss spectroscopy of localized surface plasmons in gold and silver nanoparticlescitations
- 2017The substrate effect in electron energy-loss spectroscopy of localized surface plasmons in gold and silver nanoparticlescitations
- 2015Effect of Magnetostatic Interactions on Twin Boundary Motion in NiMnGa Magnetic Shape Memory Alloycitations
- 2014Interferometric methods for mapping static electric and magnetic fieldscitations
- 2014Magnetic Imaging with a Novel Hole-Free Phase Platecitations
- 2014Towards quantitative off-axis electron holographic mapping of the electric field around the tip of a sharp biased metallic needlecitations
- 2010Near-Curie magnetic anomaly at the Ni/C interface observed by Electron Holographycitations
- 2010Dynamical Response of Catalytic Systems in a CS Corrected Environmental Transmission Electron Microscope
- 2007Polaron melting and ordering as key mechanisms for colossal resistance effects in manganites.citations
- 2006Quantitative shadow technique for the investigation of magnetic domain wall widthscitations
Places of action
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article
Towards quantitative off-axis electron holographic mapping of the electric field around the tip of a sharp biased metallic needle
Abstract
We apply off-axis electron holography and Lorentz microscopy in the transmission electron microscope to map the electric field generated by a sharp biased metallic tip. A combination of experimental data and modelling provides quantitative information about the potential and the field around the tip. Close to the tip apex, we measure a maximum field intensity of 82 MV/m, corresponding to a field k factor of 2.5, in excellent agreement with theory. In order to verify the validity of the measurements, we use the inferred charge density distribution in the tip region to generate simulated phase maps and Fresnel (out-of-focus) images for comparison with experimental measurements. While the overall agreement is excellent, the simulations also highlight the presence of an unexpected astigmatic contribution to the intensity in a highly defocused Fresnel image, which is thought to result from the geometry of the applied field. (C) 2014 AIP Publishing LLC.