Interparticle interaction and size effect in polymer coated magnetite nanoparticles

Details Interparticle interaction and size effect in polymer coated magnetite nanoparticles Interparticle interaction and size effect in polymer coated magnetite nanoparticles

2006-04-05

arxiv.org/abs/cond-mat/0604119v2

J. Phys.: Condens 18 (2006) 9093.

Physics

Condensed Matter

Materials Science

Scientific paper

10.1088/0953-8984/18/39/035

Magnetization and Mossbauer studies have been performed on the polymer coated magnetite nanoparticles with particle size from 5.1 to 14.7 nm. The maximum in the temperature dependence of magnetization (TM) is found to be inconsistent with the particle size (DTEM). The effective magnetic anisotropy (Kan) is found to increase with the decrease of DTEM, which is attributed to the increase of surface anisotropy. The absence of coercivity and remanence of magnetization noticed well above TM indicates the superparamagnetic behaviour, which has also been observed in the temperature dependent Mossbauer results. The temperature dependence of hyperfine field is found to follow similar dependence of saturation magnetization for bulk magnetite.

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