Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Magnetic Heusler Compounds

MA 25.12: Vortrag

Mittwoch, 13. März 2013, 12:15–12:30, H10

Magnetic properties of Heusler nanocrystals inside carbon nanotubes — •Markus Gellesch, Maria Dimitrakopoulou, Maik Scholz, Sabine Wurmehl, Silke Hampel, and Bernd Büchner — Leibniz Institut für Festkörper- und Werkstoffforschung Dresden

Magnetic properties of nanoscale systems may differ largely from the magnetism in the respective bulk phase and thus can lead to the emergence of interesting and also novel physical properties. Here we present results of investigations of thermomagnetic properties of Heusler nanoparticles prepared inside multi-walled carbon nanotubes via a wet-chemical approach. We observe chemical stable Co₂FeGa nanoparticles with a narrow diameter distribution, a high degree of crystallinity and with a well-defined stoichiometry within the experimental error. Our study shows, that the coercive field of the Heusler nanocrystals inside carbon nanotubes is greatly enhanced and depends on the mean diameter of the Heusler nanocrystals, while the saturation magnetic moment known from the bulk phase is preserved. The results of our work open the door for the exploration of Heusler materials at the nanoscale and also guide the way to the synthesis of nano materials with tailored physical properties.