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Dr. Juan Escrig, University of Santiago de Chile, Department of Physics

Magnetic configurations, reversal modes and magnetostatic interactions in cylindrical nanoparticles

Anfang
22.03.2012 14:00 Uhr
Veranstaltungsort
N 270, Bld. 4.8

We have calculated analytical expressions for the total magnetic energy of two characteristic internal configurations of nanotubes. Thus, we have obtained a magnetic phase diagram with respect to the aspect ratio of the tubes that allows a discussion about the possibility of getting ensembles of nanotubes with low coercive fields.
Beside, we have investigated the magnetic switching of ferromagnetic nanowires and nanotubes as a function of their geometry. It is found that for long particles the reversal of magnetization is achieved by two mechanisms: The propagation of a transverse domain wall or propagation of a vortex domain wall depending on the geometrical parameters.
Finally, we have developed an analytical model for the full long-range magnetostatic interaction between two uniformly magnetized wires and tubes that allow us to explore the possibility of varying the geometry and the position of the particles. We assume that both particles are parallel, and the direction of their magnetization vectors is fixed, parallel to the symmetry axis of each of them. Moreover, we extend our analysis and obtain the forces between two cylindrically shaped nanoparticles.

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