%0 Journal Article
%T Effects of Annealing Temperature on Co30Cu70 Mechanical Alloys
%A Watcharee RATTANASAKULTH
%A Chitnarong SIRISATHITKUL
%J Walailak Journal of Science and Technology
%D 2006
%I Walailak University
%R 10.2004/vol3iss2pp251-260
%X Physical properties of Co30Cu70 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 ˇăC for 30 min modified thermal behaviors but only slightly affected magnetic properties. Higher temperature annealing (400 - 500 ˇăC) led to substantial oxidation of Co and Cu and deteriorated magnetic properties. Pressed Co30Cu70 pellets exhibited 0.6 - 2 % giant magnetoresistance (GMR) but showed modest GMR after heat treatment. GMR disappeared by annealing at 500 ˇăC as large fractions of Co and Cu were converted into oxides.
%K Giant magnetoresistance
%K mechanical alloying
%K annealing
%U http://wjst.wu.ac.th/index.php/wjst/article/view/141