{
  "id": "2104.04426",
  "version": "v1",
  "published": "2021-04-09T15:25:08.000Z",
  "updated": "2021-04-09T15:25:08.000Z",
  "title": "Spin diffusion length associated to out-of-plane resistivity of Pt thin films in spin pumping experiments",
  "authors": [
    "Claudio Gonzalez-Fuentes",
    "Randy K. Dumas",
    "Bernat Bozzo",
    "Alberto Pomar",
    "Ricardo Henriquez",
    "Calos García"
  ],
  "comment": "7 pages, 4 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.other"
  ],
  "abstract": "We present a broadband ferromagnetic resonance study of the Gilbert damping enhancement ($\\Delta \\alpha$) due to spin pumping in NiFe/Pt bilayers. The bilayers, which have negligible interfacial spin memory loss, are studied as a function of the Pt layer thickness ($t_{\\text{Pt}}$) and temperature (100-293 K). Within the framework of diffusive spin pumping theory, we demonstrate that Dyakonov-Perel (DP) or Elliot-Yaffet (EY) spin relaxation mechanisms acting alone are incompatible with our observations. In contrast, if we consider that the relation between spin relaxation characteristic time ($\\tau_{\\text{s}}$) and momentum relaxation characteristic time ($\\tau_{\\text{p}}$) is determined by a superposition of DP and EY mechanisms, the qualitative and quantitative agreement with experimental results is excellent. Remarkably, we found that $\\tau_{\\text{p}}$ must be determined by the out-of-plane electrical resistivity ($\\rho$) of the Pt film and hence its spin diffusion length ($\\lambda_{\\text{Pt}}$) is independent of $t_{\\text{Pt}}$. Our work settles the controversy regarding the $t_{\\text{Pt}}$ dependence of $\\lambda_{\\text{Pt}}$ by demonstrating its fundamental connection with $\\rho$ considered along the same direction of spin current flow. \\end{abstract}",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-04-09T15:25:08.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spin diffusion length",
      "pt thin films",
      "spin pumping experiments",
      "out-of-plane resistivity",
      "relaxation characteristic time"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}