Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 471, Issue -, Pages 475-481Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2018.09.081
Keywords
CoPt; Polyol process; Coercivity; Curie temperature
Funding
- Department of Science and Technology (DST), Govt. of India through FAST track project [SR/FTP/ETA-11/2008]
- FIST programme [SR/FST/PSI-117/2007]
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Co30Cu10Pt60 nanoparticles were prepared by a simplified polyol process devoid of any surfactants or capping agents. Thermo-magnetic analysis showed that the addition of 10 at.% Cu reduces the Curie temperature of Co40Pt60 from 492 degrees C to 435 degrees C. The incorporation of Cu is effective in reducing the threshold ordering temperature for the A1-fcc to L1(0)-fct phase transformation of CoPt, resulting in coercivity enhancement. Coercivity close to 10 kOe at a lower annealing temperature of 600 degrees C in Co30Cu10Pt60 demonstrates that high coercivity in CoPt can be achieved in non-equiatomic compositions also. Annealing temperature dependent two phase behavior has been understood by 8M studies.
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