Regensburg 2002 – scientific programme
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SYSP: Spintronics in Grundlagen und Anwendungen
SYSP V: HV V
SYSP V.1: Invited Talk
Thursday, March 14, 2002, 11:30–12:00, H1
Interacting magnetic nano-particles: simulations at finite — •Klaus D. Usadel1, U. Nowak1, and D. Hinzke2 — 1Theoretische 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)