Nano Archive

Dominant dipolar interaction and glassy magnetic behaviour in polymer-coated magnetite nanoparticles

Thakur, M and Chowdhury, M. Pal and Majumdar, S and Giri, S (2008) Dominant dipolar interaction and glassy magnetic behaviour in polymer-coated magnetite nanoparticles. NANOTECHNOLOGY, 19 (4).

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Official URL: http://www.iop.org/EJ/abstract/0957-4484/19/4/0457...

Abstract

The static and dynamic properties of magnetization have been investigated for polymer-coated magnetite nanoparticles with sizes from 5 to 15 nm. The analysis of the temperature dependence of zero-field-cooled magnetization indicates that the effective anisotropy constant is found to increase with the decrease of particle size, which is ascribed to the increase of surface anisotropy. The relaxation of the remanent magnetization clearly shows the signature of dominant dipolar interparticle interaction. The dynamics of magnetization also indicates the signature of glassy magnetic behaviour. The memory effect in the temperature dependence of field-cooled magnetization is noticed, which is inconsistent with the glassy magnetic behaviour.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Physical Science > Nanomagnetics
ID Code:1290
Deposited By:Anuj Seth
Deposited On:15 Dec 2008 12:53
Last Modified:02 Mar 2009 16:04

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