TY - JOUR
T1 - Formation, crystallized structure and magnetic properties of Fe-Pt-B amorphous alloys
AU - Inoue, Akihisa
AU - Zhang, Wei
AU - Tsurui, Takako
AU - Louzguine, Dmitri V.
PY - 2005/4
Y1 - 2005/4
N2 - 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 (M r/MS), coercivity (iHc) and maximum energy product (BH)max were 0.96 T, 0.83, 340kA/m and 102.2 kJ/m 3, 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 γi-FePt and soft Fe2B and γ-FePt magnetic phases.
AB - 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 (M r/MS), coercivity (iHc) and maximum energy product (BH)max were 0.96 T, 0.83, 340kA/m and 102.2 kJ/m 3, 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 γi-FePt and soft Fe2B and γ-FePt magnetic phases.
KW - Amorphous
KW - Crystallized structure
KW - Iron-platinum-boron alloy
KW - Melt-spun
KW - Nanocomposite permanent magnet
UR - http://www.scopus.com/inward/record.url?scp=20844437037&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=20844437037&partnerID=8YFLogxK
U2 - 10.2320/matertrans.46.891
DO - 10.2320/matertrans.46.891
M3 - Article
AN - SCOPUS:20844437037
SN - 1345-9678
VL - 46
SP - 891
EP - 894
JO - Materials Transactions
JF - Materials Transactions
IS - 4
ER -