{
  "id": "0811.2960",
  "version": "v1",
  "published": "2008-11-18T17:56:08.000Z",
  "updated": "2008-11-18T17:56:08.000Z",
  "title": "Controlling the efficiency of spin injection into graphene by carrier drift",
  "authors": [
    "C. Józsa",
    "M. Popinciuc",
    "N. Tombros",
    "H. T. Jonkman",
    "B. J. van Wees"
  ],
  "comment": "4 pages, 3 color figures",
  "journal": "Phys. Rev. B 79, 081402(R) (2009)",
  "doi": "10.1103/PhysRevB.79.081402",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Electrical spin injection from ferromagnetic metals into graphene is hindered by the impedance mismatch between the two materials. This problem can be reduced by the introduction of a thin tunnel barrier at the interface. We present room temperature non-local spin valve measurements in cobalt/aluminum-oxide/graphene structures with an injection efficiency as high as 25%, where electrical contact is achieved through relatively transparent pinholes in the oxide. This value is further enhanced to 43% by applying a DC current bias on the injector electrodes, that causes carrier drift away from the contact. A reverse bias reduces the AC spin valve signal to zero or negative values. We introduce a model that quantitatively predicts the behavior of the spin accumulation in the graphene under such circumstances, showing a good agreement with our measurements.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-11-18T17:56:08.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "72.25.Hg",
      "73.63.-b"
    ],
    "keywords": [
      "carrier drift",
      "spin injection",
      "temperature non-local spin valve measurements",
      "room temperature non-local spin valve",
      "efficiency"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2009,
      "month": "Feb",
      "volume": 79,
      "number": 8,
      "pages": "081402"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvB..79h1402J"
    }
  }
}