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Träfflista för sökning "WFRF:(Idrobo Juan Carlos) srt2:(2014)"

Sökning: WFRF:(Idrobo Juan Carlos) > (2014)

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1.
  • Krivanek, Ondrej L., et al. (författare)
  • Toward Single Mode, Atomic Size Electron Vortex Beams
  • 2014
  • Ingår i: Microscopy and Microanalysis. - 1431-9276 .- 1435-8115. ; 20:3, s. 832-836
  • Tidskriftsartikel (refereegranskat)abstract
    • We propose a practical method of producing a single mode electron vortex beam suitable for use in a scanning transmission electron microscope (STEM). The method involves using a holographic "fork" aperture to produce a row of beams of different orbital angular momenta, as is now well established, magnifying the row so that neighboring beams are separated by about 1 mu m, selecting the desired beam with a narrow slit, and demagnifying the selected beam down to 1-2 angstrom in size. We show that the method can be implemented by adding two condenser lenses plus a selection slit to a straight-column cold-field emission STEM. It can also be carried out in an existing instrument, the monochromated Nion high-energy-resolution monochromated electron energy-loss spectroscopy-STEM, by using its monochromator in a novel way. We estimate that atom-sized vortex beams with <= 20 pA of current should be attainable at 100-200 keV in either instrument.
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2.
  • Rusz, Jan, et al. (författare)
  • Achieving Atomic Resolution Magnetic Dichroism by Controlling the Phase Symmetry of an Electron Probe
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 113:14, s. 145501-
  • Tidskriftsartikel (refereegranskat)abstract
    • The calculations presented here reveal that an electron probe carrying orbital angular momentum is just a particular case of a wider class of electron beams that can be used to measure electron magnetic circular dichroism (EMCD) with atomic resolution. It is possible to obtain an EMCD signal with atomic resolution by simply breaking the symmetry of the electron probe phase distribution using the aberration-corrected optics of a scanning transmission electron microscope. The required phase distribution of the probe depends on the magnetic symmetry and crystal structure of the sample. The calculations indicate that EMCD signals utilizing the phase of the electron probe are as strong as those obtained by nanodiffraction methods.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Rusz, Jan (2)
Idrobo, Juan Carlos (2)
Bhowmick, Somnath (1)
Krivanek, Ondrej L. (1)
Lovejoy, Tracy J. (1)
Dellby, Niklas (1)
Lärosäte
Uppsala universitet (2)
Språk
Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
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2014 (2)Ta bort avgränsningen

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