Archiviertes Physik-Kolloquium:

26. May. 2011, 16:15 Uhr, Gebäude NW1, Raum H3

Electron holography and environmental TEM: a unique view of magnetism and catalysis at the nanoscale

Prof. Dr. Rafal E. Dunin-Borkowski, Ernst Ruska Centre (ER-C) and Peter Grünberg Institute (PGI) Forschungszentrum Jülich

I will present a selection of recent results that illustrate how modern transmission electron microscopy techniques can be used to provide quantitative information about functional properties and dynamic processes in nanoscale materials and devices. The first part of the talk will concentrate on the application of off-axis electron holography to measure magnetic fields in materials with sub-5-nm spatial resolution, including working deep-submicron magnetic devices examined in situ in the electron microscope and both individual and closely-spaced sub-20-nm nanocrystals. The second part of the talk will contain results obtained by using an aberration-corrected monochromated environmental transmission electron microscope to study chemical reactions and growth processes in supported catalysts and magnetic materials examined at elevated temperature in a gas reaction environment in real time with close-to-atomic spatial resolution. I will conclude by discussing the care required to understand the effect of the hi