• DocumentCode
    1074516
  • Title

    The migration of Fe dopants in CrO2 particles

  • Author

    Bottoni, G. ; Candolfo, D. ; Cecchetti, A. ; Masoli, F. ; Corrieri, R.

  • Author_Institution
    Dept. di Phys., Ferrara Univ., Italy
  • Volume
    24
  • Issue
    2
  • fYear
    1988
  • fDate
    3/1/1988 12:00:00 AM
  • Firstpage
    1820
  • Lastpage
    1822
  • Abstract
    The effect of various thermal treatment on acicular CrO2 particles doped with Fe and Sb is analyzed. A weak thermal treatment (Tc) produces a reduction of the coercivity which is ascribed to a migration of Fe dopants from the bulk of the particle to the surface of the particle. A strong thermal treatment (T>Tc) enhances the Fe migration from the bulk to the surface and greatly reduces the coercivity and the Curie temperature. A successive weak annealing (Tc) gives rise to a partial recovery of lHc and Tc ascribed to a migration of Fe from the surface layer to the bulk of the particle. The activation energy for the Fe migration ranges from 0.3 to 0.8 eV.
  • Keywords
    Curie temperature; antimony; chromium compounds; coercive force; diffusion in solids; heat treatment; impurities; iron; magnetic properties of fine particles; CrO2:Fe,Sb; Curie temperature; Fe migration; coercivity; thermal treatment; Coercive force; Iron; Magnetic anisotropy; Magnetic hysteresis; Magnetosphere; Perpendicular magnetic anisotropy; Remanence; Saturation magnetization; Tail; Temperature;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/20.11613
  • Filename
    11613
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1074516