Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 23: Bio-und molekularer Magnetismus
MA 23.11: Vortrag
Donnerstag, 27. März 2003, 12:45–13:00, HSZ/401
Ferromagnetic Carbon with Enhanced Curie Temperature — •Vladimir Narozhnyi1,2, Karl-Hartmut Müller1, Manfred Wolf1, Dieter Eckert1, Angelika Teresiak1, Lothar Dunsch1, Valerii Davydov2, Ludmila Kashevarova2, and Alexandra Rakhmanina2 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, PO Box 270116, D-01171 Dresden, Germany — 2Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow Region, 142190, Russia
The discovery of a ferromagnetic form of carbon [T.L. Makarova et al., Nature 413 (2001) 716] gives a new perspective in the investigation of magnetic materials. The existence of a ferromagnetic state with the very high Curie temperature TC ≈ 500 K for a material with only s- and p-electrons as well as the nature of its underlying interaction are of great fundamental interest. Here we report on the observation of the ferromagnetically ordered state in a material obtained by high-pressure high-temperature treatment of the fullerene C60. It has a saturation magnetization more than four times larger than that reported previously. From our data we estimated the considerably higher value of TC ≈ 820 K.