• DocumentCode
    71843
  • Title

    High K_{{{u}}} and Low Intergranular Exchange Coupling of Postannealed CoPt-WO3 Granular Film

  • Author

    Kim Kong Tham ; Hinata, Shintaro ; Saito, Sakuyoshi ; Takahashi, Masaharu

  • Author_Institution
    Tanaka Kikinzoku Kogyo K. K., Tokyo, Japan
  • Volume
    50
  • Issue
    11
  • fYear
    2014
  • fDate
    Nov. 2014
  • Firstpage
    1
  • Lastpage
    4
  • Abstract
    Magnetic properties and microstructure of Co80Pt20-30 vol.% (Al2O3, TiO2, WO3) and Co82.4Pt17.6-27.7 vol.% SiO2 granular films postannealed at various temperatures in a heat-treating furnace were investigated. In this paper, it is found that among these granular films, CoPt-WO3 granular film shows the highest coercivity (Hc) because of low intergranular exchange coupling of well-isolated magnetic grains. Furthermore, the Hc is enhanced with postannealing because of the increase of the magnetic anisotropy field (Hkgrain) and uniaxial magnetocrystalline anisotropy (Kugrain) of the columnar growth magnetic grains. The increase of Kugrain for the postannealed granular film primarily originates from the reduction of the stacking faults as well as the lattice constant ratio.
  • Keywords
    aluminium compounds; annealing; cobalt alloys; coercive force; discontinuous metallic thin films; exchange interactions (electron); grain growth; granular materials; lattice constants; magnetic anisotropy; platinum alloys; stacking faults; titanium compounds; tungsten compounds; Co80Pt20-Al2O3; Co80Pt20-TiO2; Co80Pt20-WO3; Co82.4Pt17.6-SiO2; coercivity; columnar growth magnetic grains; heat-treating furnace; high-Ku intergranular exchange coupling; lattice constant ratio; low-intergranular exchange coupling; magnetic anisotropy; magnetic properties; microstructure; post-annealed CoPt-WO3 granular film; stacking faults; uniaxial magnetocrystalline anisotropy; Magnetic properties; Microstructure; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Stacking; CoPt-WO3 granular film; high Ku; perpendicular magnetic recording; postannealing;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.2014.2321025
  • Filename
    6971658
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=71843