Dependence of energy dissipation on annealing temperature of melt{endash}spun NdFeB permanent magnet materials

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.362294· OSTI ID:280062

Gao, Z; Jiles, D C; Branagan, D J; McCallum, R W ^[1]

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1. Ames Laboratory, Ames, Iowa 50011 (United States)

A model of magnetic hysteresis which was developed originally for soft magnetic materials has been applied to melt{endash}spun ribbons of Nd{sub 2}Fe{sub 14}B-based material. The crucial ideas in the model description of hysteresis center on a dissipation of energy due to hysteresis which is proportional to the change in magnetization. The Nd{sub 2}Fe{sub 14}B material was melt{endash}spun amorphous and then annealed for a period of 24 h at temperatures ranging from 700 to 950{degree}C. This resulted in different grain sizes, depending on annealing temperature. Consequently the hysteresis curves represent the properties of the material as a function of both annealing temperature and grain size. It was found that the magnetic properties varied systematically with annealing temperature, and hence grain size, as would be expected. When modeling the magnetic properties it was found that the model parameters also varied systematically, in particular, the energy dissipation parameter {ital k} was to a first approximation a simple linear function of the annealing temperature and decreased with increasing annealing temperature as a result of grain growth. Therefore, this study revealed a basic relationship between materials processing conditions, microstructure, model parameters, and magnetic properties. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 280062
• Report Number(s): CONF-951101--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORPHOUS STATE
ANNEALING
ENERGY LOSSES
HYSTERESIS
IRON BORIDES
MAGNETIC MATERIALS
MELT SPINNING
MICROSTRUCTURE
NEODYMIUM BORIDES
PERMANENT MAGNETS
RIBBONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 1000-4000 K