{
  "id": "0907.2027",
  "version": "v2",
  "published": "2009-07-12T11:25:40.000Z",
  "updated": "2009-08-27T13:12:46.000Z",
  "title": "Vortex-like state observed in ferromagnetic contacts",
  "authors": [
    "I. K. Yanson",
    "Yu. G. Naidyuk",
    "V. V. Fisun",
    "O. P. Balkashin",
    "L. Yu. Triputen",
    "A. Konovalenko",
    "V. Korenivski"
  ],
  "comment": "4 pgs., 4 figs. submitted to ICM-09 (July 26-21, Karlsruhe) V2: corrected typos, accepted for publication in J. Phys.: Conf. Series",
  "journal": "Journal of Physics: Conference Series 200 (2010) 052033",
  "doi": "10.1088/1742-6596/200/5/052033",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Point-contacts (PC) offer a simple way to create high current densities, 10^9 A/cm^2 and beyond, without substantial Joule heating. We have shown recently (Nano Letters, 7 (2007) 927) that conductivity of nanosized PCs between a normal and ferromagnetic metals exhibits bi-stable hysteretic states versus both bias current and external magnetic field - the effect typical for spin-valve structures. Here we report that apart from the bi-stable state a third intermediate-resistance state is occasionally observed. We interpret this state as due to a spin-vortex in the PC, nucleated either by Oersted field of the bias current and/or by the circular geometry of PC. The observed three-level-states in the PC conductivity testify that the interface spins are both weakly coupled to the spins in the bulk and have depressed exchange interaction within the surface layer.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-08-27T13:12:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ferromagnetic contacts",
      "vortex-like state",
      "bias current",
      "create high current densities",
      "third intermediate-resistance state"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Journal of Physics Conference Series",
      "year": 2010,
      "month": "Jan",
      "volume": 200,
      "number": 5,
      "pages": "052033"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010JPhCS.200e2033Y"
    }
  }
}