Abstract
The disordered random-anisotropy magnetic nanoparticle systems with competingdipolar interactions and ferromagnetic exchange couplings are investigatedby Monte Carlo simulations. Superspin glass (SSG) and superferromagnetic(SFM) behaviors are found at low temperatures depending on the interactions.Based on the mean-field approximation, the Curie–Weiss temperatureTCW = 0 is suggested as the phase boundary between the SSG systems and the SFM systems, whichis evidenced by the spontaneous magnetizations and relaxations. The magnetic phasediagram is plotted.
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