Details zur Publikation
Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1103/PhysRevMaterials.4.126001
Volltext Akzeptiertes Manuskript
Titel (primär) Structural, vibrational, and magnetic properties of self-assembled CoPt nanoalloys embedded in SrTiO3
Autor Hennes, M.; Fonda, E.; Casaretto, E.; Buchwald, J. ORCID logo ; Weng, X.; Patriarche, G.; Demaille, D.; Zheng, Y.; Vidal, F.
Quelle Physical Review Materials
Erscheinungsjahr 2020
Department ENVINF
Band/Volume 4
Heft 12
Seite von art. 126001
Sprache englisch
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 (T≃670∘C). 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.
dauerhafte UFZ-Verlinkung 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 10.1103/PhysRevMaterials.4.126001