Influence of quenching rate on the microstructure and magnetic properties of melt-spun L1{sub 0}-FePt/Fe{sub 2}B nanocomposite magnets
- Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
The quenching rate, which is dependent on the surface velocity (V{sub s}) of Cu wheel during melt spinning, has significant influence on the formation of nanocomposite structure in the Fe{sub 52}Pt{sub 32}B{sub 18} melt-spun ribbons. The L1{sub 0}-FePt/Fe{sub 2}B hard magnetic nanocomposite structure was formed at V{sub s}=20-37 m/s, while the soft magnetic fcc-FePt+amorphous phases were formed at V{sub s}=40-50 m/s. The ribbons melt spun at V{sub s}=37 m/s exhibit in-plane coercivity ({sub i}H{sub c})=760 kA/m, remanence (B{sub r})=0.71 T, and energy product (BH){sub max}=93.4 kJ/m{sup 3}. The B{sub r}=0.74-0.77 T, {sub i}H{sub c}=681-718 kA/m, and (BH){sub max}=101-108 kJ/m{sup 3} were obtained for the ribbons melt spun at V{sub s}=50 m/s 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 L1{sub 0}-FePt and soft Fe{sub 2}B magnetic phases.
- OSTI ID:
- 20982868
- Journal Information:
- Journal of Applied Physics, Vol. 101, Issue 9; Conference: 10. joint MMM/INTERMAG conference, Baltimore, MD (United States), 7-11 Jan 2007; Other Information: DOI: 10.1063/1.2711714; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AMORPHOUS STATE
ANNEALING
BINARY ALLOY SYSTEMS
BORON ALLOYS
COERCIVE FORCE
COMPOSITE MATERIALS
EXCHANGE INTERACTIONS
FCC LATTICES
FERROMAGNETIC MATERIALS
IRON ALLOYS
IRON BORIDES
MAGNETIC PROPERTIES
MICROSTRUCTURE
NANOSTRUCTURES
PERMANENT MAGNETS
PLATINUM ALLOYS
QUENCHING
TERNARY ALLOY SYSTEMS