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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.84: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Monte Carlo simulations for Hollow Invar Nanoparticles — •Sanjeev K. Nayak, Markus E. Gruner, and Peter Entel — Institute of Physics, University of Duisburg-Essen, Duisburg Campus, 47048 Duisburg, Germany

Monte Carlo simulations for Fe₆₅Ni₃₅ hollow spherical Invar nanoparticles have been performed with an effective spin-1 Ising model with coupled magnetic and spatial degrees of freedom taking into account the occurrence of high and low magnetic moments in Fe rich γ-FeNi alloys. Heating the system up above the Curie point starting from the ferromagnetic ground state and subsequent cooling breaks the system into domains. This effect depends on the size of the particle and the thickness of the shell. The energy difference between the domain state and the ferromagnetic phase is very low due to the fact that the low spin atoms form the domain boundary. To compare these results similar calculations were performed on pure hollow Ni nanoparticles.