Study of the coercivity for Nd-Fe-B-Ga sintered magnets

Study of the coercivity for Nd-Fe-B-Ga sintered magnets

The Ga-composition dependence of the Curie temperature, the anisotropy field, and the coercivity are studied for Nd-Fe-B-Ga sintered magnets. It is shown that a smaller addition of Ga atoms increases not only the Curie temperature but also the coercivity. A rise in coercivity does not result from th...

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Veröffentlicht in:IEEE (Institute of Electrical and Electronics Engineers) Transactions on Magnetics; (USA) 1989-09, Vol.25 (5), p.3429-3430
Hauptverfasser: Hu, Jifan, Wang, Zhenxi, Wang, Yizhong, Zhao, Jiangao, Rao, Xialei, Zhang, Nanning
Format: Artikel
Sprache:eng
Schlagworte:
360101 - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties
ALLOYS
Anisotropic magnetoresistance
ANISOTROPY
Argon
Artificial intelligence
Atmosphere
BORON ALLOYS
CHEMICAL COMPOSITION
COERCIVE FORCE
CURIE POINT
DISLOCATION PINNING
FABRICATION
GALLIUM ADDITIONS
GALLIUM ALLOYS
Heat treatment
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETS
MATERIALS SCIENCE
NEODYMIUM ALLOYS
NUCLEATION
PHYSICAL PROPERTIES
Powders
RARE EARTH ALLOYS
SINTERING
Temperature dependence
Temperature sensors
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
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Beschreibung
Zusammenfassung:The Ga-composition dependence of the Curie temperature, the anisotropy field, and the coercivity are studied for Nd-Fe-B-Ga sintered magnets. It is shown that a smaller addition of Ga atoms increases not only the Curie temperature but also the coercivity. A rise in coercivity does not result from the change of anisotropy field for Nd/sub 16/Fe/sub 77/B/sub 7-x/Ga/sub x/ sintered magnets. It is also found that the coercivity for a Nd/sub 16/Fe/sub 77/Ga/sub 2/B/sub 5/ magnet, which has lower B content, is controlled by nucleation whereas for the magnet Nd/sub 13.5/Dy/sub 1.5/Fe/sub 75/Al/sub 2/B/sub 8/ (iH/sub c/=18 kOe), two kinds of coercivity mechanisms (pinning and nucleation) coexist.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.42324