Formation, Crystallized Structure and Magnetic Properties of Fe–Pt–B Amorphous Alloys

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  • Inoue Akihisa
    Institute for Materials Research, Tohoku University
  • Zhang Wei
    Institute for Materials Research, Tohoku University Core Research for Evolutional Science and Technology, Japan Science and Technology Agency
  • Tsurui Takako
    Institute for Materials Research, Tohoku University
  • Louzguine Dmitri V.
    Institute for Materials Research, Tohoku University

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  • Formation, Crystallized Structure and Magnetic Properties of Fe–Pt–B Amorphous Alloys

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Abstract

An amorphous phase was formed for (Fe0.75Pt0.25)100−xBx (x=25 and 30) alloys by melt-spinning. Their crystallization temperature were 671 and 667 K, respectively. The amorphous alloys exhibited good soft magnetic properties. The crystallized structure consisted of γ1-FePt (fct), Fe2B and γ-FePt (fcc) phases, and their average grain sizes were about 15 nm after annealing at 785 K for 900 s. The remanence (Br), reduced remanence (Mr⁄Ms), coercivity (iHc) and maximum energy product (BH)max were 0.96 T, 0.83, 340 kA/m and 102.2 kJ/m3, respectively, for the 25 at%B alloy, and 0.91 T, 0.82, 368 kA/m and 96.5 kJ/m3, respectively, for the 30 at%B alloy. The reversible demagnetization loop behavior was also confirmed. Consequently, the good hard magnetic properties are interpreted as resulting from exchange magnetic coupling among nanoscale hard γ1-FePt and soft Fe2B and γ-FePt magnetic phases.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 46 (4), 891-894, 2005

    The Japan Institute of Metals and Materials

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