Interplay between local structure and magnetic properties of graded exchange-coupled Co@FePt nanocomposite films

Charles Paleo, Véronique Dupuis, Fabrice Wilhelm, Andrei Rogalev, Olivier Proux, Olivier Boisron, Isabelle Kieffer, Thierry Epicier, Matthieu Bugnet, and Damien Le Roy
Phys. Rev. B 102, 224409 – Published 10 December 2020
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Abstract

Hard magnetic nanocomposites are attractive materials for integration in various microsystems and for building of next-generation permanent magnets. However, exploiting their full potential requires control of their microstructure at the nanometer scale. Studying these materials in model systems synthesized by nanofabrication routes provides interesting insights into the interplay between the microstructure and the magnetic performances. Here, by using a combination of mass-selected low-energy cluster beam deposition and electron-beam evaporation, we prepare nanocomposite films where Co nanoinclusions are integrated in a hard magnetic FePt matrix. Local atomic structures and element-selective magnetic properties of such nanocomposites have been thoroughly investigated using polarization-dependent hard x-ray absorption spectroscopies. These results demonstrate that magnetically soft inclusions are stabilized at room temperature, emphasizing the role of interdiffusion in the preparation of nanocomposites.

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  • Received 16 September 2020
  • Revised 13 November 2020
  • Accepted 23 November 2020

DOI:https://doi.org/10.1103/PhysRevB.102.224409

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Charles Paleo1,*, Véronique Dupuis1, Fabrice Wilhelm2, Andrei Rogalev2, Olivier Proux3, Olivier Boisron1, Isabelle Kieffer3, Thierry Epicier4, Matthieu Bugnet4, and Damien Le Roy1

  • 1Institut Lumière Matière, Université Claude Bernard Lyon 1, CNRS, Villeurbanne F-69622, France
  • 2The European Synchrotron Radiation Facility (ESRF), 38000 Grenoble, France
  • 3Observatoire des Sciences de l'Univers de Grenoble, Université Grenoble Alpes, CNRS, 38041 Grenoble, France
  • 4Université de Lyon, INSA-Lyon, Université Claude Bernard Lyon 1, MATEIS UMR CNRS 5510, Villeurbanne F-69621, France

  • *charles.paleo@univ-lyon1.fr

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Issue

Vol. 102, Iss. 22 — 1 December 2020

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