TY - JOUR
T1 - Influence of quenching rate on the microstructure and magnetic properties of melt-spun L 10 -FePt Fe2 B nanocomposite magnets
AU - Zhang, Wei
AU - Yubuta, Kunio
AU - Sharma, Parmanand
AU - Makino, Akihiro
AU - Inoue, Akihisa
N1 - Funding Information:
This work was financially supported by Research and Development Project on Advanced Metallic Glasses, Inorganic Materials and Joining Technology from the Ministry of Education, Science, Sports, and Culture of Japan.
PY - 2007
Y1 - 2007
N2 - The quenching rate, which is dependent on the surface velocity (Vs) of Cu wheel during melt spinning, has significant influence on the formation of nanocomposite structure in the Fe52 Pt32 B18 melt-spun ribbons. The L 10 -FePt Fe2 B hard magnetic nanocomposite structure was formed at Vs =20-37 ms, while the soft magnetic fcc-FePt+amorphous phases were formed at Vs =40-50 ms. The ribbons melt spun at Vs =37 ms exhibit in-plane coercivity (Hci) =760 kAm, remanence (Br) =0.71 T, and energy product (BH)max =93.4 kJ m3. The Br =0.74-0.77 T, Hci =681-718 kAm, and (BH)max =101-108 kJ m3 were obtained for the ribbons melt spun at Vs =50 ms and annealed at 748-773 K for 900 s. The improvement in hard magnetic properties is due to the formation of more finer and homogeneous nanocomposite structure, which results in the enhancement in exchange coupling among the nanosized hard L 10 -FePt and soft Fe2 B magnetic phases.
AB - The quenching rate, which is dependent on the surface velocity (Vs) of Cu wheel during melt spinning, has significant influence on the formation of nanocomposite structure in the Fe52 Pt32 B18 melt-spun ribbons. The L 10 -FePt Fe2 B hard magnetic nanocomposite structure was formed at Vs =20-37 ms, while the soft magnetic fcc-FePt+amorphous phases were formed at Vs =40-50 ms. The ribbons melt spun at Vs =37 ms exhibit in-plane coercivity (Hci) =760 kAm, remanence (Br) =0.71 T, and energy product (BH)max =93.4 kJ m3. The Br =0.74-0.77 T, Hci =681-718 kAm, and (BH)max =101-108 kJ m3 were obtained for the ribbons melt spun at Vs =50 ms and annealed at 748-773 K for 900 s. The improvement in hard magnetic properties is due to the formation of more finer and homogeneous nanocomposite structure, which results in the enhancement in exchange coupling among the nanosized hard L 10 -FePt and soft Fe2 B magnetic phases.
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U2 - 10.1063/1.2711714
DO - 10.1063/1.2711714
M3 - Article
AN - SCOPUS:34248570324
SN - 0021-8979
VL - 101
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 9
M1 - 09K518
ER -