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Original Article

The Effect of Annealing in Magnetic Field on FePt3 and CoPt3 Nanoparticles



FePt3 and CoPt3 compound nanoparticles were studied, magnetically and structurally. Compound ordering in crystal structure of these nanoparticles is formed at 600ºC. Meanwhile, the shape and size of grains are prominent to be controlled. In this work, layers of FePt3 and CoPt3 nanoparticles with thicknesses of respectively 20nm and 10nm were fabricated on Si wafer, in L12 compound ordered phase. In these layers the size of nanoparticles were less than 10nm according to Field Emission Scanning Electron Microscopy (FE-SEM) analyses. Direct synthesis method using sputtering system was applied. In order to orient nanoparticles, they were annealed, at 350ºC and then cooled, in magnetic field of 30mT. X-ray Diffraction (XRD) and Vibrating Sample Magnetometer (VSM) analyses showed crystalline, compound and directional ordering of these nanoparticles, respectively.