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Title (Primary) Structural, vibrational, and magnetic properties of self-assembled CoPt nanoalloys embedded in SrTiO3
Author Hennes, M.; Fonda, E.; Casaretto, E.; Buchwald, J.; Weng, X.; Patriarche, G.; Demaille, D.; Zheng, Y.; Vidal, F.;
Journal Physical Review Materials
Year 2020
Department ENVINF;
Volume 4
Issue 12
Language englisch;
POF III (all) T53;
Abstract Pulsed laser deposition was used to synthesize vertically aligned nanocomposites, consisting of ultrathin CoPt nanocolumns embedded in a single crystal SrTiO3 thin film. Combining high-resolution transmission electron microscopy, x-ray diffraction, x-ray absorption spectroscopy, and molecular dynamics simulations, we provide an in-depth analysis of the structural and vibrational properties of the CoPt phase over a wide range of concentrations. Our findings show that the CoPt nanoalloys are characterized by a high degree of structural disorder and complete absence of chemical ordering, even after additional sample annealing (T670C). 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, which is at odds with bulk predictions. These findings, further confirmed by magnetometry measurements, illustrate the profound impact of vertical epitaxy on the structural properties of bimetallic CoPt alloys.
ID 24110
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24110
Hennes, M., Fonda, E., Casaretto, E., Buchwald, J., Weng, X., Patriarche, G., Demaille, D., Zheng, Y., Vidal, F. (2020):
Structural, vibrational, and magnetic properties of self-assembled CoPt nanoalloys embedded in SrTiO3
Phys. Rev. Mater. 4 (12), art. 126001