The coverage-dependent magnetic response and anisotropy of epitaxial Co/Cu(110) nanoparticle arrays were studied. A paramagnetic-ferromagnetic phase transition is found to occur at a critical thickness dC=4.6±1.15ML. In the vicinity of dC, the paramagnetic susceptibility {χ} follows a power-law behavior. The observed magnetic phase transition is due to the two-dimensional percolation of epitaxial Co particles with a critical exponent γ=2.39±0.08. At the very onset of the long-range ferromagnetic order, a uniaxial anisotropy induced by the nanoscale Co particles was observed.
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Gu et al. (1999) studied this question.
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