期刊名称：Walailak Journal of Science and Technology (WJST)
印刷版ISSN：2228-835X
出版年度：2011
卷号：3
期号：2
页码：251-260
语种：English
出版社：Institute of Research and Development, Walailak University.
摘要：Physical properties of Co 30 Cu 70 mechanical alloys prepared by ball milling were investigated. After milling for 50 h, the powder contained Co-rich, Cu-rich clusters as well as Co-Cu solid solution. Annealing at 200 - 300 °C for 30 min modified thermal behaviors but only slightly affected magnetic properties. Higher temperature annealing (400 - 500 °C) led to substantial oxidation of Co and Cu and deteriorated magnetic properties. Pressed Co 30 Cu 70 pellets exhibited 0.6 - 2 % giant magnetoresistance (GMR) but showed modest GMR after heat treatment. GMR disappeared by annealing at 500 °C as large fractions of Co and Cu were converted into oxides.
