Study on Composition Distribution and Ferromagnetism of Monodisperse FePt Nanoparticles
1 Faculty of Physics and Electronic Technology, Hubei University, 430062, Wuhan, People’s Republic of China
2 Department of Physics, The Chinese University of Hong Kong, Hong Kong, People’s Republic of China
Nanoscale Research Letters 2010, 5:489-493 doi:10.1007/s11671-010-9549-6Published: 4 February 2010
Monodisperse FePt nanoparticles with size of 4.5 and 6.0 nm were prepared by simultaneous reduction of platinum acetylacetonate and thermal decomposition of iron pentacarbonyl in benzylether. The crystallography structure, size, and composition of the FePt nanoparticles were examined by X-ray diffraction and transmission electron microscopy. Energy dispersive X-ray spectrometry measurements of individual particles indicate a broad compositional distribution in both the 4.5 and 6 nm FePt nanoparticles. The effects of compositional distribution on the phase-transition and magnetic properties of the FePt nanoparticles were investigated.