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Tailoring the morphology of CoxPt1−x magnetic nanostructures
Authors:S. Mourdikoudis  K. Gloystein  C. Dendrinou-Samara  O. Kalogirou
Affiliation:a Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
b Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
Abstract:CoxPt1−x nanostructures with varying composition and controllable morphologies have been synthesized through the thermal decomposition of appropriate platinum and cobalt precursors in organic solvents. The employment of several different surfactants facilitated the production of nanostructures with various sizes and shapes including nanowires, flower-like structures and spherical particles. The composition of the as-prepared nanomaterials ranged between Pt-rich and stoichiometric CoPt alloy, mainly depending on the starting ratio of the precursors. Three-dimensional structures such as the ‘flower-like’ ones showed a net ferromagnetic behavior, even at room temperature. In certain cases, the alloy nanostructures were annealed in order to obtain the ‘hard’ fct-CoPt phase, which displayed high coercivity values.
Keywords:CoPt   Nanostructure   Nanoparticle   Magnetic property
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