Formation, Crystallized Structure and Magnetic Properties of Fe-Pt-B Amorphous Alloys
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An amorphous phase was formed for (Fe<SUB>0.75</SUB>Pt<SUB>0.25</SUB>)<SUB>100−<I>x</I></SUB>B<I><SUB>x</SUB></I> (<I>x</I>=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 γ<SUB>1</SUB>-FePt (fct), Fe<SUB>2</SUB>B and γ-FePt (fcc) phases, and their average grain sizes were about 15 nm after annealing at 785 K for 900 s. The remanence (<I>B</I><SUB>r</SUB>), reduced remanence (<I>M</I><SUB>r</SUB>⁄<I>M</I><SUB>s</SUB>), coercivity (<I>iH</I><SUB>c</SUB>) and maximum energy product (<I>BH</I>)<SUB>max</SUB> were 0.96 T, 0.83, 340 kA/m and 102.2 kJ/m<SUP>3</SUP>, respectively, for the 25 at%B alloy, and 0.91 T, 0.82, 368 kA/m and 96.5 kJ/m<SUP>3</SUP>, 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 γ<SUB>1</SUB>-FePt and soft Fe<SUB>2</SUB>B and γ-FePt magnetic phases.
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