Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Magnetic Instrumentation and Characterization
MA 6.4: Vortrag
Montag, 20. März 2017, 10:15–10:30, HSZ 403
User-selected electron vortex beams for atomic scale magnetic measurements — •Darius Pohl1, Sebastian Schneider1,2, Paul Zeiger3, Jakob Spiegelberg3, Jan Rusz3, Peter Tiemeijer4, Sorin Lazar4, Xiaoyan Zhong5, Kornelius Nielsch1,2, and Bernd Rellinghaus1 — 1IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany — 2TU Dresden, D-01062 Dresden, Germany — 3Uppsala University, Department of Physics and Astronomy, SE-752 37 Uppsala, Sweden — 4FEI Company, PO Box 80066, 5600 KA Eindhoven, The Netherlands — 5NCEM Beijing, Tsinghua University, Beijing 100084, P.R. China
Electron vortex beams (EVBs) carry a discrete orbital angular momentum (OAM), L, and are predicted to reveal magnetic dichroism in electron energy loss spectroscopy upon interacting with magnetic samples. Focusing the probe down to sub-nanometer diameters is, however, a necessary condition to be fulfilled. The generation of atom-size EVBs in the double aberration-corrected FEI Titan33 80-300 transmission electron microscope (TEM) is achieved by the implementation of a dislocation-type apertures into the condenser lens system. A new optical setup allows for scanning TEM investigations (STEM) with vortex beams, whose OAM is selected by means of an additional discriminator aperture. Performance of this new optical setup is shown by atomic resolution imaging as well as spectroscopy on SrTiO3. First measurements on magnetic samples will be presented.