Monte Carlo simulation study of exchange biased hysteresis loops in nanoparticles

Details Monte Carlo simulation study of exchange biased hysteresis loops in nanoparticles Monte Carlo simulation study of exchange biased hysteresis loops in nanoparticles

2005-10-27

arxiv.org/abs/cond-mat/0510730v1

Physica B 372, 247-250 (2006)

Physics

Condensed Matter

Materials Science

9 pages, 3 figures embedded. To be published in Physica B

Scientific paper

10.1016/j.physb.2005.10.059

We present the results of Monte Carlo simulations of the magnetic properties of a model for a single nanoparticle consisting in a ferromagnetic core surrounded by an antiferromagnetic shell. The simulations of hysteresis loops after cooling in a magnetic field display exchange bias effects. In order to understand the origin of the loop shifts, we have studied the thermal dependence of the shell and interface magnetizations under field cooling. These results, together with inspection of the snapshots of the configurations attained at low temperature, show the existence of a net magnetization at the interface which is responsible for the bias of the hysteresis loops.

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