[Zurück]

S. Schneider, D. Pohl, T. Schachinger, S. Löffler, P. Schattschneider, B. Rellinghaus:
"Exploring in properties of individual nanomagnets: EMCD on FePt nanocubes";
Poster: 79^th Annual Meeting of the DPG and Spring Meeting of the Condensed Matter Section, Berlin, BRD; 15.03.2015 - 20.03.2015.

Electron magnetic chiral dichroism (EMCD) is the electron wave analogue of X-ray magnetic circular dichroism (XMCD). It offers the possibility to study magnetic properties at the nanoscale in a transmission electron microscope (TEM). In a `classical´ EMCD setup, the sample is illuminated with a plane electron wave and acts as a beam splitter. Although this method is meanwhile well established, only very few EMCD spectra were so far obtained from individual nanoparticles. We report on EMCD measurements on individual FePt nanocubes with a size of roughly 30 nm and compare our experimental findings with simulations. The dichroic signals at the 𝐿3 and 𝐿2 edges are expected to be as small as 10 % of the total scattering intensity. Our experiments are supported by simulations utilizing the WIEN2k program package, based on which FePt cubes with a thickness, that should provide maximal EMCD signals, are chosen for the experiments. The experiments indeed reveal a small but reproducible dichroic signal that agrees well with the results of the theoretical calculations.