Phys. Rev. Lett. 84, 167–170 (2000)Influence of Dipolar Interaction on Magnetic Properties of Ultrafine Ferromagnetic ParticlesReceived 11 January 1999; revised 18 May 1999; published in the issue dated 3 January 2000 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 TB 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 TB, the relaxational behavior of the magnetic moments below TB is not in accordance with the picture of cooperative freezing. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.167
DOI:
10.1103/PhysRevLett.84.167
PACS:
75.50.Tt, 75.40.Mg, 75.50.Lk
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