Ferromagnetism in diluted magnetic semiconductors (DMS) has been a subject of great scientific and technological interest for the past few years due to its implications for spintronics, advanced magneto-optics and sensors applications. Our research involves a modified co-precipitation approach that allows controlled growth of Fe3O4/gamma-Fe2O3 nanocrystals within the superparamagnetic and single domains limits by creating the precipitating conditions with the help of hydrolase reaction of the urea. XRD confirms the formation of the ferrite and the partial loss of host crystallinity observed in X-ray diffraction patterns thereby suggests that the process of cluster formation involves aggregation within the large cages of the zeolite and local destruction of the pores network. Room-temperature M-H measurements verifies the influence of synthesis conditions and crystal size on the magnetic properties of ferrite nanocrystals. Distinct absorption maxima in diffuse reflectance UV-visible spectra and sharp exciton peaks in low-temperature excitation spectra verified the presence of quantum-confined Fe3O4/gamma-Fe2O3.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 21, 2010
Pages: 838 - 841
Industry sector: Advanced Materials & Manufacturing
Topicss: Advanced Materials for Engineering Applications, Composite Materials