• DocumentCode
    789306
  • Title

    Magnetic properties of SmCo7/Co and Sm(Co,Fe)7/α-(Fe,Co) nanocomposite magnets prepared by magnetic annealing

  • Author

    Cui, B.Z. ; Huang, M.-Q. ; Liu, S.

  • Author_Institution
    Magnetics Lab., Univ. of Dayton, OH, USA
  • Volume
    39
  • Issue
    5
  • fYear
    2003
  • Firstpage
    2866
  • Lastpage
    2868
  • Abstract
    The effect of applying a magnetic field during the crystallization process of mechanically milled SmCo9.5 and Sm(Co0.88Fe0.12)9.5 alloys on the nanostructure, exchange coupling, and magnetic properties has been studied. Compared with samples annealed without the magnetic field, there was a noticeable improvement in the intrinsic coercivity iHc, the remanence Br, and the maximum magnetic energy product (BH)max for SmCo9.5 and Sm(Co0.88Fe0.12)9.5 alloys annealed in a 10 kOe field. An improvement of 31.5% of (BH)max was obtained for SmCo9.5 alloy after the magnetic annealing. Better rectangularity of the demagnetization curves was also observed for SmCo9.5 and Sm(Co0.88Fe0.12)9.5 alloys after the magnetic annealing. The improvement in the magnetic properties after magnetic annealing is considered to be the result of enhanced exchange coupling, resulting from modifications of nanostructure induced by the magnetic field during the crystallization process of the mechanically milled alloys in a nearly perfect amorphous state.
  • Keywords
    cobalt; cobalt alloys; coercive force; crystallisation; demagnetisation; exchange interactions (electron); ferromagnetic materials; iron alloys; magnetic annealing; nanocomposites; permanent magnets; samarium alloys; Sm(Co,Fe)7/α-(Fe,Co) nanocomposite magnets; Sm(Co0.88Fe0.12)9.5; Sm(CoFe)7-(FeCo); SmCo7-Co; SmCo7/Co nanocomposite magnets; SmCo9.5; crystallization process; demagnetization curves; exchange coupling; intrinsic coercivity; magnetic annealing; magnetic properties; maximum magnetic energy product; mechanically milled; remanence; Amorphous magnetic materials; Annealing; Coercive force; Couplings; Crystallization; Demagnetization; Iron alloys; Magnetic fields; Magnetic properties; Remanence;
  • fLanguage
    English
  • Journal_Title
    Magnetics, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9464
  • Type

    jour

  • DOI
    10.1109/TMAG.2003.815730
  • Filename
    1233242
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=789306