High coercivity below percolation threshold in polymer nanocomposite

Shekhar, S and Sajitha, EP and Prasad, V and Subramanyam, SV (2008) High coercivity below percolation threshold in polymer nanocomposite. In: Journal of Applied Physics, 104 (8). 083910-1.

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Abstract

The magnetic properties of nanocomposites of polymer and magnetic (carbon cased iron carbide) nanoparticles have been studied from 300 to 10 K. The nanocomposites show an enhanced coercivity and they retain the magnetic properties at very low concentration of filler. The high coercivity is produced due to dipolar interaction between nanoparticles. A low value of Mr/Ms is observed for nanocomposites, which increases at low temperatures. The dependence of saturation magnetization on temperature follows Bloch's T3/2 law and a departure from that is observed at higher temperatures. The Mössabauer spectra of nanocomposites show a sextet, which correspond to a ferromagnetic behavior of nanocomposites.

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	14 Sep 2009 09:29
Last Modified:	19 Sep 2010 04:57
URI:	http://eprints.iisc.ac.in/id/eprint/17566

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