{
  "id": "cond-mat/0210199",
  "version": "v3",
  "published": "2002-10-09T16:02:40.000Z",
  "updated": "2003-05-19T10:05:00.000Z",
  "title": "Effect of exchange interaction on superparamagnetic relaxation",
  "authors": [
    "H. Kachkachi"
  ],
  "comment": "7 pages, 2 eps figures, fig.1 of better quality can be provided upon request",
  "journal": "Eur. Phys. Lett. 62 (2003) 650-656",
  "doi": "10.1209/epl/i2003-00423-y",
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "We use Langer's approach to calculate the reaction rate of a system of two (classical) spins interacting via the exchange coupling $J$ in a magnetic field $H$, with uniaxial anisotropy of constant $K$. We find a particular value of the exchange coupling, that is $j\\equiv J/K = j_c\\equiv 1-h^2$, where $h\\equiv H/2K$, which separates two regimes corresponding to a two-stage and one-stage switching. For $j\\gg j_c$ the N\\'eel-Brown result for the one-spin problem is recovered.",
  "revisions": [
    {
      "version": "v3",
      "updated": "2003-05-19T10:05:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "exchange interaction",
      "superparamagnetic relaxation",
      "one-spin problem",
      "langers approach",
      "neel-brown result"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}