Dataset Evaluation of spin mixing conductance in Co2FeGa0.5Ge0.5/Pt bilayer and the effect of ultrathin Cu, Ni, Ru, Ta, or Cr insertion layers

バト マダブ モハン (Research Center for Magnetic and Spintronic Materials/Magnetic Functional Device Group, National Institute for Materials Science) ; SASAKI Taisuke SAMURAI ORCID (Research Center for Structural Materials/Materials Evaluation Field/Microstructure Analysis Group, National Institute for Materials Science) ; Hirofumi Suto SAMURAI ORCID (Research Center for Magnetic and Spintronic Materials/Magnetic Functional Device Group, National Institute for Materials Science) ; A. Perumal (Indian Institute of Technology (IIT) Guwahati) ; A. Srinivasan (Indian Institute of Technology (IIT) Guwahati) ; Yuya Sakuraba SAMURAI ORCID (Research Center for Magnetic and Spintronic Materials/Magnetic Functional Device Group, National Institute for Materials Science)

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バト マダブ モハン, SASAKI Taisuke, Hirofumi Suto, A. Perumal, A. Srinivasan, Yuya Sakuraba. Evaluation of spin mixing conductance in Co2FeGa0.5Ge0.5/Pt bilayer and the effect of ultrathin Cu, Ni, Ru, Ta, or Cr insertion layers. https://doi.org/10.48505/nims.5824

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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)^(↑↓)

Data origin type: other

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

Date published:

Publisher: American Physical Society

Journal:

  • Physical Review Materials

Funding:

  • Advanced Storage Research Consortium
  • JST CREST JPMJCR21O1
  • MEXT X-NICS JPJ011438

Manuscript type: Not a journal article

MDR DOI: https://doi.org/10.48505/nims.5824

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Updated at: 2025-10-30 09:05:18 +0900

Published on MDR: 2025-10-28 08:16:31 +0900

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