Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.64: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Thermodynamically Extended Preisach Modeling of Magnetic Properties of Ni-Nanoparticles in Fullerene Films — •Sven Schubert and Günter Radons — Chemnitz University of Technology, D-09107 Chemnitz
For developing high-density recording memories decreasing the particle size and optimizing their packing is necessary. Therefor, small molecules, e.g. fullerene (C60), are used as a matrix for metallic magnetic nanoparticles. As the scales are shrinking the interaction between particles and the properties of the interface to the surrounding medium are enhanced.
To avoid a complicated surface dependency and gain a more general model a thermodynamically extended Preisach approach is used for modeling the magnetic behavior of Ni nanoparticles embedded in fullerene matrices.
The achieved results are compared to experimental data [1].
Among other things, it is shown that
taking into account small particle hysteresis
leads to a better agreement with SQUID measurements than
using a standard practice Preisach distribution function.
This suggests a physical picture
consisting of a large number of small particles
with small coercive fields within the matrix.
G. Salvan et al. J. Appl. Phys. submitted.