Co 50 Pt 50 nanoparticles were codeposited on thermally oxidized Si substrates by electron beam evaporation, at a temperature of the substrate of 700to750°C. The codeposition led to a perfect mixture of the Co and Pt elements within the three-dimensional nanoislands, which exhibit a mean diameter between ∼18 and ∼20nm. The postannealing treatment of the CoPt nanograins resulted in the progressive crystallization of the L10 ordered phase and, consequently, in the progressive magnetic hardening of the samples with a maximum coercivity of ∼5.6kOe.
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Castaldi et al. (2004) studied this question.
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