Coevaporation of CoPt nanoparticles

Castaldi, L.; Giannakopoulos, K.; Travlos, A.; Niarchos, D.
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2854
Academic Journal
Co50Pt50 nanoparticles were codeposited on thermally oxidized Si substrates by electron beam evaporation, at a temperature of the substrate of 700 to 750 °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 ∼20 nm. 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 ∼5.6 kOe.


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