{
  "id": "1703.10921",
  "version": "v1",
  "published": "2017-03-31T14:40:03.000Z",
  "updated": "2017-03-31T14:40:03.000Z",
  "title": "Temperature Dependence of the Anisotropy Field of L10 FePt near the Curie Temperature",
  "authors": [
    "H. J. Richter",
    "G. J. Parker"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Near the Curie temperature the anisotropy field of magnetically uniaxial L10 FePt is expected to follow the scaling law $(1-T/Tc)^\\beta$ where $T$ is the temperature and $T_c$ the Curie temperature. In the literature $\\beta$ values between 0.36 and 0.65 have been reported. Based on recording measurements and micromagnetic analysis, we show that only the values of $\\beta$ near the low end of the reported range are compatible with the data. We also conclude that thermally activated magnetization reversal at temperatures near $T_c$ cannot be ignored, even at time scales smaller than 1 ns. We demonstrate that thermally activated magnetization reversal at temperatures close to $T_c$ is well described by conventional theory with a frequency factor $f_0$ of the order of $10^{12}$ Hz. It is reasoned that the unusually high value for $f_0$ is a consequence of the temperature-induced reduction of the degree of alignment of the micro-spins within the grains.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-03-31T14:40:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "curie temperature",
      "anisotropy field",
      "temperature dependence",
      "thermally activated magnetization reversal",
      "time scales smaller"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}