Maghemite (γ-Fe2O3) nanoparticles are synthesized by chemical co-precipitation technique in AOT-microemulsion with a view to have possible application for biotagging. The investigations by means of X-ray diffraction, isothermal magnetization M (H) and 57Fe Mössbauer Spectroscopy show that the particles are nonspherical, mostly of rod shape. The inter-particle interaction is so large that even a powder sample of thickness about 40 mg/cm2 shows preferential orientation of magnetic moments in the plane of the sample. The saturation magnetization is much lower than the expected values for maghemite.
Keywords: Maghemite, Magnetic nanoparticles, Magnetic Ordering, Mössbauer spectroscopy
International Journal of Engineering, Science and Technology, Vol. 2, No. 8, 2010, pp. 33-39
Department of Physics, Indian Institute of Technology, Kanpur 208016, INDIA.
Nanotechnology and Molecular Biology Laboratory, Center for Biotechnology, University of Allahabad, INDIA
Department of Chemistry, MNNIT Allahabad, Allahabad, INDIA
Department of Physics, Indian Institute of Technology, Kanpur 208016, INDIA