Magnetic hardening of melt-spun nanocomposite Nd{sub 2}Fe{sub 14}B/Fe magnets

Journal Article · Mon Apr 01 00:00:00 EST 1996 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.361621· OSTI ID:282083

Panagiotopoulos, I; Withanawasam, L; Murthy, A S; Hadjipanayis, G C ^[1]; Singleton, E W; Sellmyer, D J ^[2]

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1. Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)
2. University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)

Coercivity optimization studies were done on melt-spun nanocomposite Nd{sub 4}R{sub 2}Fe{sub 87{minus}{ital x}}NbT{sub x}B{sub 6} (R=Nd,Y,Dy; T=Ag,Cu) isotropic ribbon samples. The maximum attainable coercivities, after adjusting the annealing time, were found to be very sensitive to the annealing temperatures. The optimum magnetic properties [{ital H}{sub {ital C}}=3.9 kOe, (BH){sub max}=10 MGOe] were obtained by annealing at 750{endash}775{degree}C for a few minutes. Optimization by flash annealing gave similar results. Microstructural studies show that the grain size is greater than the theoretically predicted grain size for optimum coupling between the hard and the soft phase. With the annealing conditions used, Nd{sub 4}Dy{sub 2}Fe{sub 87}NbB{sub 6} samples gave moderate coercivities and in Nd{sub 4}Y{sub 2}Fe{sub 87}NbB{sub 6} samples the coercivity was reduced more than the expected reduction in the anisotropy field due to the presence of Y. {copyright} {ital 1996 American Institute of Physics.}

• DOE Contract Number: FG02-86ER45262; FG02-90ER45413
• OSTI ID: 282083
• Report Number(s): CONF-951101-; ISSN 0021-8979; TRN: 96:018940
• Journal Information: Journal of Applied Physics, Vol. 79, Issue 8; Conference: 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995; Other Information: PBD: Apr 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
COERCIVE FORCE
MAGNETIC MATERIALS
IRON ALLOYS
IRON BORIDES
NEODYMIUM BORIDES
SILVER ALLOYS
COPPER ALLOYS
YTTRIUM ALLOYS
DYSPROSIUM ALLOYS
ANNEALING
MICROSTRUCTURE
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
TIME DEPENDENCE
OPTIMIZATION
MELT SPINNING
RIBBONS