Exchange bias in a core/shell magnetic nanoparticle: Monte Carlo simulation
Abstract
By using Monte Carlo simulation on a ferromagnetic core/antiferromagnetic shell nanoparticle, we investigate in details the exchange bias of the magnetic hysteresis as a function of both core radius and shell thickness, at low temperature. It is found that the exchange bias is very sensitive to the core radius and a small variation of the radius may lead to a big fluctuation of the bias. In a general tendency the exchange bias is enhanced by increasing shell thickness and decreasing core radius. The intrinsic correlation between the exchange bias and the spin configuration on the core-shell interface is demonstrated. We further investigate the dependence of the exchange bias on temperature and random field inside the nanoparticle, indicating a monotonous decreasing of the bias with the magnitude of random field and temperature, respectively.
Cite
@article{arxiv.cond-mat/0612228,
title = {Exchange bias in a core/shell magnetic nanoparticle: Monte Carlo simulation},
author = {M. H. Wu and Q. C. Li and J. M. Liu},
journal= {arXiv preprint arXiv:cond-mat/0612228},
year = {2007}
}