Journal article Evaluation of spin mixing conductance in Co 2 Fe Ga 0.5 Ge 0.5 / Pt bilayer and the effect of ultrathin Cu, Ni, Ru, Ta, or Cr insertion layers
Madhav M. Bhat (author) (Search by this author)
;
H. Suto (author) (Search by this author)
ORCID https://orcid.org/0000-0003-4387-5862
National Institute for Materials Science
SAMURAI NIMS Researchers Directory SAMURAI
ORCID SAMURAI ;
T. T. Sasaki (author) (Search by this author)
ORCID https://orcid.org/0000-0002-5952-7638
National Institute for Materials Science
SAMURAI NIMS Researchers Directory SAMURAI
ORCID SAMURAI ;
A. Perumal (author) (Search by this author)
;
A. Srinivasan (author) (Search by this author)
;
Y. Sakuraba (author) (Search by this author)
ORCID https://orcid.org/0000-0003-4618-9550
National Institute for Materials Science
SAMURAI NIMS Researchers Directory SAMURAI
ORCID SAMURAI
20260713_MDR_Evaluation of spin mixing conductance in Co2FeGa0.5Ge0.5_Pt bilayer and the effect of ultrathin Cu Ni Ru Ta or Cr insertion layers.pdf
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Madhav M. Bhat, H. Suto, T. T. Sasaki, A. Perumal, A. Srinivasan, Y. Sakuraba. Evaluation of spin mixing conductance in Co 2 Fe Ga 0.5 Ge 0.5 / Pt bilayer and the effect of ultrathin Cu, Ni, Ru, Ta, or Cr insertion layers. Physical Review Materials. 2026, 10 (5), 54414-54414. https://doi.org/10.1103/b5xh-ypg7

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(abstract)

Improving the spin mixing conductance at the ferromagnet/heavy metal (FM/HM) interface with a low Gilbert damping constant in the FM layer is a key requirement for developing efficient spintronic devices. To evaluate the potential of Co2FeGa0.5Ge0.5 as the FM layers in such structures, epitaxial Co2FeGa0.5Ge0.5 single-layer and Co2FeGa0.5Ge0.5/Pt bilayer films were deposited on MgO substrate using magnetron sputtering, and their Gilbert damping constants were evaluated from ferromagnetic resonance spectra. While the single-layer samples exhibit a low damping constant of ~ 1.07×10-3, an enhancement in the damping constant was observed in the bilayer samples due to spin pumping across the Co2FeGa0.5Ge0.5/Pt interface, from which relatively large spin mixing conductance (g_(eff_Pt)^(↑↓)) of (2.78±0.09)×1019 m-2 was evaluated. Further, to investigate the effect of interface property on g_(eff_Pt)^(↑↓), ultrathin (~ 0.2 nm) Cu, Ni, Ru, Ta, or Cr insertion layers were introduced between the Co2FeGa0.5Ge0.5 and Pt. The observed change in g_(eff_Pt)^(↑↓) depends on the insertion material, indicating that their physical properties, such as magnetic, non-magnetic, antiferromagnetic, light or heavy metal, reflect on g_(eff_Pt)^(↑↓)

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Keyword: Spin pumping, Magnetization dynamics, Spin current, Ferromagnetic resonance, Half-metals, Heusler alloy, Magnetic thin films

Date published: 2026-05-20

Publisher: American Physical Society (APS)

Journal:

  • Physical Review Materials (ISSN: 24759953) vol. 10 issue. 5 p. 54414-54414

Funding:

  • Advanced Storage Research Consortium
  • Core Research for Evolutional Science and Technology JPMJCR21O1
  • Ministry of Education, Culture, Sports, Science and Technology JPJ011438
  • Exploratory Research for Advanced Technology JPMJER2201

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6408

First published URL: https://doi.org/10.1103/b5xh-ypg7

Related item:

  • is_supplemented_by
    • Evaluation of spin mixing conductance in Co2FeGa0.5Ge0.5/Pt bilayer and the effect of ultrathin Cu, Ni, Ru, Ta, or Cr insertion layers (dataset)
    • https://doi.org/10.48505/nims.6269

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Updated at: 2026-07-14 15:37:51 +0900

Published on MDR: 2026-07-14 18:35:55 +0900

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