Magnetic properties and coercivity mechanism of precipitation-hardened Gd-Co based ribbons

• 来源期刊: 中国物理（英文版）
• 关键词: precipitation hardening high-temperature magnetic properties coercivity mechanism
• 年，卷（期）: 2004,（7）
• 页码范围: 1144-1148
• 页数: 5页
• 语种: 英文

摘要

Gd(Co0.88-xCuxFe0.09Zr0.03)z ribbons with x ＝ 0.075 - 0.200 and z＝6.4-7.7 have been prepared by a meltspinning 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.