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Regensburg 2016 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 2: Analytical Electron Microscopy: SEM and TEM-based Material Analysis

MI 2.3: Vortrag

Dienstag, 8. März 2016, 12:45–13:00, H5

Quantifying the magnetism of individual nanomagnets: EMCD on FePt nanoparticles — •Sebastian Schneider1,2, Darius Pohl1, Stefan Löffler3, Deepa Kasinathan5, Jan Rusz6, Peter Schattschneider3,4, Schultz Ludwig1,2, and Bernd Rellinghaus11IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden, Germany — 2TU Dresden, Institut fur Festkörperphysik, D-01062 Dresden, Germany — 3Vienna University of Technology, USTEM, A-1040 Vienna, Austria — 4Vienna University of Technology, Institute of Solid State Physics, A-1040 Vienna, Austria — 5Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany — 6Uppsala University, S-75105 Uppsala, Sweden

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 an electron plane wave and acts as a beam splitter. Although it is meanwhile established that EMCD allows for the measurement of magnetic dichroism, only few examples are available that present quantitative results. We report on EMCD measurements on individual FePt nanoparticles with a thickness of roughly 10 nm and compare our experimental findings with simulations. From the experimental spectra, a ratio of angular to spin magnetic moment ml/ms = 0.084 ± 0.076 is for the first time quantitatively derived for individual FePt nanoparticles.

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