Physics – Condensed Matter – Materials Science
Scientific paper
2004-07-07
Phys. Stat. Sol. A, 201, 3329 (2004)
Physics
Condensed Matter
Materials Science
Contribution to SCM 2004 (2nd Seeheim Conference on Magnetism), to be published in Physica Status Solidi. 5 pages, 3 figures
Scientific paper
10.1002/pssa.200405486
Monte Carlo simulations are used to study the magnetic relaxation of a system of single domain particles with dipolar interactions modeled by a chain of Heisenberg classical spins. We show that the so-called $T\ln(t/\tau_0)$ method can be extended to interacting systems and how, from the computed master relaxation curves, the effective energy barrier distributions responsible for the relaxation can be obtained. A transition from a quasi-logarithmic to power-law behavior of the relaxation as the interaction strength is in-creased is found. By direct computation of the effective energy barriers of the system, we show that this is due to the appearance of an increasing number of small energy barriers caused by the reduction of the anisotropy energy barriers as the local dipolar fields increase.
Iglesias Oscar
Labarta Amilcar
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