Abstract Gd(Co$_{0.88-x}$Cu$_x$Fe$_{0.09}$Zr$_{0.03})_z$ ribbons with x=0.075-0.200 and z=6.4－7.7 have been prepared by a melt-spinning technique. A cellular microstructure consisting of 2:17 cells surrounded by the 1:5 cell boundary phase is obtained after precipitation hardening. The dependence of room temperature coercivity on the heat treatment process suggests that the long-time isothermal aging is not helpful for the development of magnetic properties. Positive temperature coefficient of remanence from room temperature to about 673K is typical for all samples, while positive temperature coefficient of coercivity is obtained only in ribbons with low Cu content. The coercivity mechanism of the precipitation-hardened ribbons at different temperatures is also discussed.
Received: 27 November 2003
Revised: 25 December 2003
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project supported by the National High Technology Development Programme of China (Grant No 2001AA324019).
Cite this article:
Rong Chuan-Bing (荣传兵), Zhang Jian (张健), Du Xiao-Bo (杜晓波), Zhang Hong-Wei (张宏伟), Zhang Shao-Ying (张绍英), Shen Bao-Gen (沈保根) Magnetic properties and coercivity mechanism of precipitation-hardened Gd－Co based ribbons 2004 Chinese Physics 13 1144
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