• DocumentCode
    1050818
  • Title

    Alloy powders for magnetic recording tape

  • Author

    Kawasaki, M. ; Higuchi, Suemi

  • Author_Institution
    Sony Corporation Research Center, Yokohama, Japan
  • Volume
    8
  • Issue
    3
  • fYear
    1972
  • fDate
    9/1/1972 12:00:00 AM
  • Firstpage
    430
  • Lastpage
    432
  • Abstract
    A new process for making acicular Fe-Co alloy particles for high density recording tapes and for master tapes of magnetic contact printing is presented. The method consists of adsorption of Co(OH)2colloid on the surface of fine goethite particles, heat treatment at 700°C in air to diffuse Co++ into the particles, followed by reduction to the metallic alloy state. The alloy powders with 10 to 50 atm % of Co showed coercive force higher than 1000 Oe and saturation magnetization greater than 160 emu/g. The characteristics of new alloy powder tapes prepared by the adsorption method are measured and comparison with those of CrO2and γ-Fe2O3tapes are given.
  • Keywords
    Cobalt-iron alloys; Magnetic tape materials; Coercive force; Heat treatment; Magnetic field measurement; Magnetic recording; Powders; Printing; Productivity; Proportional control; Saturation magnetization; Surface treatment;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.1972.1067462
  • Filename
    1067462
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1050818