Regensburg 2002 – wissenschaftliches Programm

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SYSP: Spintronics in Grundlagen und Anwendungen


SYSP V.1: Hauptvortrag

Donnerstag, 14. März 2002, 11:30–12:00, H1

Interacting magnetic nano-particles: simulations at finite — •Klaus D. Usadel1, U. Nowak1, and D. Hinzke21Theoretische Physik, Gerhard-Mercator-Universität Duisburg, — 2

With decreasing size of magnetic particles, thermal activation becomes increasingly important. Additionally, in arrays of such particles the dipolar interaction among the elements will influence their magnetic behavior.
In the present contribution we report on extensive computer simulations [1] of interacting nano-particles at elevated temperatures. The simulations have been done within local spin models. Ground state properties calculated within this scheme agree with conventional micromagnetic calculations. However, our approach has the advantage that it can be generalized to finite temperatures without great difficulties.
As examples for our approach we report on magnetization dynamics and thermal equilibrium properties of single nano-particles, as, in particular, their domain configurations and stray field distributions. Additionally we discuss results for arrays of particles interacting via dipolar forces.

Work supported by the DFG through SFB 491.

[1] U. Nowak: Thermally activated reversal in magnetic nanostructures in Annual Reviews of Computational Physics IX, 105 (2001)

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