Phase separation and surface segregation in Co – Au – SrTiO3 thin films: Self-assembly of bilayered epitaxial nanocolumnar composites
Résumé
Phase separation and surface segregation are powerful levers that allow to synthesize nanocompos-ites via self-assembly. In the present work, we combine these concepts with 3-dimensional vertical epitaxial growth and study Co-Au-SrTiO3 thin films as a model system. We demonstrate that SrTiO3, Co and Au undergo phase separation during sequential pulsed laser deposition, giving rise to a dense array of ultrathin bilayered Co-Au nanowires (NWs) with highly anisotropic optical and magnetic properties. A detailed analysis of the structural properties of the embedded metallic NWs reveals stabilization of a Co fcc phase and pronounced coupling to the matrix, which leads to large magnetoelastic effects. We discuss possible growth mechanisms yielding bilayer phase separation in nanocolumnar composites and show how the present results can be used to estimate a lower bound for the Co/Au interface energy.
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