Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14043
Title: Magnetic properties of cobalt ferrite powders and thin films
Authors: WANG YONGCHAO
Keywords: Co-ferrite, thin films, sputtering, powders, nanostructure
Issue Date: 31-May-2004
Source: WANG YONGCHAO (2004-05-31). Magnetic properties of cobalt ferrite powders and thin films. ScholarBank@NUS Repository.
Abstract: Co-ferrite powders were prepared by mechanical-milling. It has been found out that magnetic properties of Co-ferrite powders are strongly dependent on preparation conditions, such as composition, annealing temperature and cooling rate. Magnetic annealing was found to enhance the magnetic remanence (Mr) in the direction parallel to the magnetic field. The kinetics of magnetic annealing has been studied. Co-ferrite films were deposited on SiO2 single-crystal substrates. The as-deposited films were amorphous. The crystallization required an annealing at 700 degree C or higher. Magnetic properties were found to be strongly dependent on annealing temperature, annealing duration and film thickness. A small film thickness can restrict the formation of large particles. A coercivity as high as 9.3 kOe was achieved in the 50-nm film after annealing at 900 degree C for 15 minutes deposited on (100)-SiO2 substrate. The high coercivity was associated with a nano-structure, lattice strain and larger Raman shift with a relatively sharp peak.
URI: http://scholarbank.nus.edu.sg/handle/10635/14043
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