Modifiering av den electroniska materialstruktur analyserat med atomär när till single atom upplösning med transmissionselektronmikroskopi
Tidsperiod: 2013-01-01 till 2015-12-31
Projektledare: Klaus Leifer
Medarbetare: Björgvin Hjörvarsson, Olle Eriksson
Budget: 2 475 000 SEK
The properties of many modern nanomaterials rely on the placement of down to individual atoms on surfaces and at interfaces. It is the aim of this project to correlate the placement of down to single atom in materials with the electrical and magnetic properties by analysing structure and electronic structure in the transmission electron microscope (TEM). This project proposes to address this quest at the example of two cases: electronic property studies in graphene and magnetic properties in nanostructured thin film interfaces. The graphene structure will be modified with nanometer resolution by focussed ion beam and electron irradiation as well as functionalisation. Both, structural and electronic structure changes will be measured using TEM. Structure/property correlations will be carried out in an in-situ platform, where graphene is electrical connected in a TEM allowing for single atom analysis of modified graphene structures. Magnetic properties of buried interfaces and magnetic nanostructures will be analysed with close to atomic scale resolution in the TEM. The change of relative spin/orbital magnetisation across internal interfaces has a crucial influence on magnetisation behaviour and will be analysed developing and refining techniques of electron magnetic circular dichroism. Such magnetic thin films containing ferromagnetic elements and oxides will be laterally structured creating disks. Orbital/spin magnetic moments in vortex cores will be observed.