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Title: Electronic, Mössbauer and magnetic studies of self-assembled monodispersed FePt nanoparticles
Authors: Gajbhiye, N S
Keywords: FePt Nanoparticles;Self-assembly;Mössbauer spectra;Anisotropy;Superparamagnetism
Issue Date: Oct-2007
Publisher: CSIR
IPC Code: B82B, G01J3/28
Abstract: The organic ligand encapsulated and bare 4 nm FePt particles, synthesized by wet chemical processing are studied for their structural, electronic and magnetic properties. The fcc phase is stable even above 833 K without any agglomeration and particle growth. The Mössbauer spectra recorded at 10 K for the as-prepared and annealed FePt nanoparticles reveal the presence of superparamagnetic and ferromagnetic fractions. The superparamagnetic blocking temperature decreases from 55 K to 10 K, after annealing at 623 K, due to the decrease in magnetocrystalline anisotropy and Fe-Pt-C is formed at the surface at elevated temperatures. Two distinct sextets are observed at 10 K with a large magnetic hyperfine field for one of the components. The 2D array of the nanoparticles and also the electronic and magnetic properties of the Fe sites are retained even after removing the organic ligand molecules.
Page(s): 805-809
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.45(10) [October 2007]

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