Magnetic properties and coercivity mechanism of isotropic HDDR NdFeB bonded magnets with Co and Dy addition

Isotropic NdDyFeCoB bonded magnets with high coercivity of 1.59 MA/m and low temperature coefficient of remanence of −0.056%/ K (in the temperature range 298–428 K) were prepared successfully by controlling the HDDR process and adjusting the compositions. The influence of Co and Dy additions on the...

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Veröffentlicht in:	Journal of magnetism and magnetic materials 2003-04, Vol.261 (1), p.222-227
Hauptverfasser:	Chen, W., Gao, R.W., Zhu, M.G., Pan, W., Li, W., Li, X.M., Han, G.B., Feng, W.C., Wang, B.
Format:	Artikel
Sprache:	eng
Schlagworte:	Bonded magnets Coercivity Condensed matter: electronic structure, electrical, magnetic, and optical properties Domain effects, magnetization curves, and hysteresis Exact sciences and technology Fe and its alloys HDDR process Magnetic properties and materials Magnetization curves, hysteresis, Barkhausen and related effects Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects Microstructure Permanent magnets Physics Studies of specific magnetic materials Temperature coefficient
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Zusammenfassung:	Isotropic NdDyFeCoB bonded magnets with high coercivity of 1.59 MA/m and low temperature coefficient of remanence of −0.056%/ K (in the temperature range 298–428 K) were prepared successfully by controlling the HDDR process and adjusting the compositions. The influence of Co and Dy additions on the magnetic properties and the magnetization reversal process in magnet was investigated. The high coercivity in (Nd 0.8Dy 0.2) 13(Fe 0.875Co 0.125) 81B 6 HDDR magnet can be attributed to its unique microstructure and the enhancement of anisotropy field of 2:14:1 phase by substitution of Nd by Dy.
ISSN:	0304-8853
DOI:	10.1016/S0304-8853(02)01477-4