{
  "id": "1512.06931",
  "version": "v1",
  "published": "2015-12-22T02:11:39.000Z",
  "updated": "2015-12-22T02:11:39.000Z",
  "title": "Spin torque study of the spin Hall conductivity and spin diffusion length in platinum thin films with varying resistivity",
  "authors": [
    "Minh-Hai Nguyen",
    "D. C. Ralph",
    "R. A. Buhrman"
  ],
  "comment": "Submitted to PRL",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We report measurements of the spin torque efficiencies in perpendicularly-magnetized Pt/Co bilayers where the Pt resistivity $\\rho_{Pt}$ is strongly dependent on thickness $t_{Pt}$ . The damping-like spin Hall torque efficiency per unit current density, $\\xi^j_{DL}$ , varies significantly with $t_{Pt}$, exhibiting a peak value $\\xi^j_{DL}=0.12$ at $t_{Pt} = 2.8 - 3.9$ nm. In contrast, $\\xi^j_{DL}/\\rho_{Pt}$ increases monotonically with $t_{Pt}$ and saturates for $t_{Pt} > 5$ nm, consistent with an intrinsic spin Hall effect mechanism, in which $\\xi^j_{DL}$ is enhanced by an increase in $\\rho_{Pt}$ . Assuming the Elliott-Yafet spin scattering mechanism dominates we estimate that the spin diffusion length $\\lambda_s = (0.77 \\pm 0.08) \\times 10^{-15} \\Omega m^2 /\\rho_{Pt}$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-12-22T02:11:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spin diffusion length",
      "spin torque study",
      "spin hall conductivity",
      "platinum thin films",
      "spin hall torque efficiency"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}