Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Magnetic Heuslers, Half-Metals and Oxides II (organized by MA)
TT 24.9: Vortrag
Montag, 31. März 2014, 17:45–18:00, BEY 118
Evolution of the coercive field of Co2FeGa Heusler nanocrystals and related oxide nanoparticles inside carbon nanotubes — •Markus Gellesch1, Usue Palomares Iñiguez de Ciriano1, Changhai Wang2, Sabine Wurmehl1, Silke Hampel1, and Bernd Büchner1 — 1Leibniz Institut für Festkörper- und Werkstoffforschung Dresden — 2Max-Planck-Institut für Chemische Physik fester Stoffe, 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 magnetic properties of Heusler nanoparticles and related oxide materials prepared inside multi-walled carbon nanotubes via a wet-chemical approach. While previous studies1 already showed, that the coercive field of the Heusler nanocrystals inside carbon nanotubes is enhanced by a factor of at least 30, we now report of an enhancement factor of approximately 100 in Co2FeGa nanoparticles and of coercive fields as large as 6000 Oe in related oxide materials. Further we present results of the diameter dependence of the coercive field in the later material. The results of our work open the door for the exploration of Heusler and related magnetic materials at the nanoscale and also guide the way to the synthesis of nanomaterials with tailored physical properties.
[1] Gellesch et al., Cryst. Growth Des., 2013, 13 (7), pp 2707–2710