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Structural, vibrational, and magnetic properties of self-assembled CoPt nanoalloys embedded in SrTiO 3

Abstract : Pulsed laser deposition was used to synthesize vertically aligned nanocomposites (VAN), consisting of ultrathin CoPt nanocolumns embedded in a single crystal SrTiO3 thin film. Combining highresolution transmission electron microscopy (HRTEM), x-ray diffraction (XRD), x-ray absorption spectroscopy (XAS) and molecular dynamics (MD) simulations, we provide an in-depth analysis of the structural and vibrational properties of the CoPt phase over a wide range of concentrations. Despite growing the samples at high temperatures (> 600 • C), we find that the CoPt nanoalloys are characterized by a high degree of structural disorder and complete absence of chemical ordering, even after additional sample annealing. Unexpectedly, for a Co concentration exceeding c(Co) 0.55, pole figure measurements unravel a transition from a highly textured short range disordered fcc phase to a disordered hcp phase with c-axis oriented out of plane. These findings, further confirmed by magnetometry measurements, illustrate the profound impact of vertical epitaxy on the structural and thermodynamic properties of bimetallic CoPt alloys.
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https://hal.archives-ouvertes.fr/hal-03095549
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Submitted on : Monday, January 4, 2021 - 4:38:23 PM
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M. Hennes, E. Fonda, N. Casaretto, J. Buchwald, X. Weng, et al.. Structural, vibrational, and magnetic properties of self-assembled CoPt nanoalloys embedded in SrTiO 3. Physical Review Materials, American Physical Society, 2020, 4 (12), ⟨10.1103/PhysRevMaterials.4.126001⟩. ⟨hal-03095549⟩

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