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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.110: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Simulation of magnetic nanoparticles for hyperthermia therapy — •Christian Haase and Ulrich Nowak — University of Konstanz, 78457 Konstanz

Systems of single domain magnetic nanoparticles are investigated in view of their aplication to magnetic particle hyperthermia therapy, where under application of an ac magnetic field these particles dissipate heat and thus can be used for cancer treatment. This is done via a numerical integration of the Landau-Lifshitz-Gilbert equation including Langevin dynamics.

For an analytical description of such a system one has to consider a relaxation model based on Browns Fokker-Planck equation [1]. The heating characteristics then can be described by linear response theory for particles in the superparamagnetic size range or a Stoner Wohlfarth model type theory for bigger particles[2,3].

We compare these approaches to our numerical calculations with special emphasis on the influence of dipolar interactions which are neglected in both analytical theories. Furthermore we discuss our results in the effort to maximise the specific loss power for acceptable fields and frequencies.

[1]W. F. Brown, Jr., Phys. Rev. 130, 1677 (1963). [2] R. Hergt et al, Nanotechnology 21, 015706 (2010). [3] N. A. Usov and Y. B. Grebenshchikov, J. Appl. Phys. 106, 023917 (2009).