Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 1, Pages 167-170Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.167
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We use Monte Carlo simulations to study the influence of dipolar interaction and polydispersity on the magnetic properties of single-domain ultrafine ferromagnetic particles. From the zero field cooling (ZFC)/field cooling (FC) simulations we observe that the blocking temperature T-B clearly increases with increasing strength of interaction, but it is almost not effected by a broadening of the distribution of particle sizes. While the dependence of the ZFC/FC curves on interaction and cooling rate are reminiscent of a spin glass transition at T-B, the relaxational behavior of the magnetic moments below T-B is not in accordance with the picture of cooperative freezing.
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