Abstract
AbstractThe dependence of remanence and coercivity on the exchange and dipolar fields in a three‐dimensional simple cubic assembly of nanoparticles is studied by a modified Monte Carlo method in which the thermal fluctuation of magnetic moments of nanoparticles is completely considered. The long‐range dipolar interaction is summed directly in real space during the simulation. It is found that the dipolar field elongates the hysteresis loop horizontally, but the exchange field elongates it vertically. The competition between dipolar and exchange interparticle interactions leads to complex dependences of the remanence and coercivity on the exchange and dipolar fields at low temperature. Both remanence and coercivity decrease with the increase of temperature. Some results are in agreement with the experimental measurements. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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