Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 16: Micro- and Nanostructured Magnetic Materials II

MA 16.3: Vortrag

Dienstag, 28. März 2006, 12:15–12:30, HSZ 103

Simulation of magnetoelastic properties of magnetic hollow microspheres — •Markus E. Gruner and Peter Entel — Theoretische Physik, Universität Duisburg-Essen, 47048 Duisburg

We investigate the properties of magnetic hollow micropheres consisting of a self-supporting closed packed arrangement of nanoparticles on a surface of a shell. Based on the setup of a recent experiment [1], we propose a model taking into account the dipolar magnetic coupling and a Lennard-Jones-like pair interaction between the individual particles. Computer simulations using the hybrid Monte Carlo method [2] allow us to obtain information on the magnetoelastic properties. Depending on the strength of the attractive interactions considerable deformations are observed. Using a rotating homgeneous magnetic field, a controlled athermal destruction of the structures is achieved, possibly making magnetic microspheres candidates for magnetically targeted drug carriers.

[1] A. Schlachter, M. E. Gruner, M. Spasova et al., Phase Transitions 78, 741 (2005)

[2] B. Mehling, D. W. Heermann, and B. M. Forrest, Phys. Rev. B 45, 679 (1992)