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Title

Order and phase nucleation in nonequilibrium nanocomposite Fe-Pt thin films with perpendicular magnetic anisotropy

AuthorsClavero Pérez, César CSIC ORCID; Skuza, J. R.; García-Martín, José Miguel CSIC ORCID ; Cebollada, Alfonso CSIC ORCID; Walko, D. A.; Lukaszew, R. A.
KeywordsAnnealing
Coercive force
Ferromagnetic materials
Grain size
Iron
Magnetic thin films
Nanocomposites
Nucleation
Perpendicular magnetic anisotropy
Platinum
X-ray diffraction
Segregation
Issue Date31-Mar-2009
PublisherAmerican Physical Society
CitationPhysical Review B, 79 (2009)
AbstractWe report on the time evolution of mass transport upon annealing nonequilibrium Fe-Pt nanocomposite films, leading to nucleation of L10 chemically ordered phase. The nonequilibrium nanocomposite films were fabricated by applying Fe+ ion implantation to epitaxial Pt films grown on (001) MgO substrates, yielding Fe nanoclusters embedded in a Pt matrix at a tailored penetration depth. Time-resolved x-ray diffraction studies were carried out using synchrotron radiation, allowing determination of the activation energy for nucleation of the FePt L10 phase within the segregated nanoclusters during annealing. The growth of the segregated L10 ordered phase was modeled using ideal grain-size law and found to be dominated by strain-driven surface nucleation. The activation energies were found to correlate with the nanocluster size. Magnetic characterization of selected annealed samples indicates perpendicular magnetic anisotropy with high coercive field coincident with high value of the chemical order parameter of the ordered phase within the magnetic nanoclusters.
Publisher version (URL)http://link.aps.org
http://dx.doi.org/10.1103/PhysRevB.79.104436
URIhttp://hdl.handle.net/10261/15440
DOI10.1103/PhysRevB.79.104436
ISSN1098-0121
Appears in Collections:(IMN-CNM) Artículos

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