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Temperature-Dependent Magnetic Properties of SiO2-Coated Ni75Fe25 Nanoparticles

Published online by Cambridge University Press:  11 February 2011

Mingzhong Wu ,
Y.D. Zhang ,
S. Hui  and
Shihui Ge
Mingzhong Wu
Affiliation:
Department of Physics and Institute of Materials Science, University of Connecticut, Storrs, CT 06269, U.S.A.
Y.D. Zhang*
Affiliation:
Inframat Corporation, 74 Batterson Park Road, Farmington, CT 06032, U.S.A.
S. Hui
Affiliation:
Inframat Corporation, 74 Batterson Park Road, Farmington, CT 06032, U.S.A.
Shihui Ge
Affiliation:
Inframat Corporation, 74 Batterson Park Road, Farmington, CT 06032, U.S.A.
*
Author to whom correspondence should be addressed; electronic mail: [email protected]
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Abstract

SiO2-coated Ni75Fe25 nanoparticles were prepared using a wet chemical method and their structure and magnetic properties were investigated using x-ray diffraction, high-resolution transmission electron microscopy, and a superconducting quantum interference device magnetometer. The SiO2 material was in an amorphous state. The Ni75Fe25 nanoparticles were in a simple cubic state and contained inner oxide (Ni-oxide and Fe-oxide) cores whose size decreased with increasing calcination temperature. The nanoparticles were basically in the ferromagnetic state. Their saturation magnetization increased with increasing calcination temperature, whereas their coercivity decreased with increasing calcination temperature. The nanoparticles exhibited strong temperature-dependent magnetic behaviors. The Bloch exponent fell from 1.5 for the bulk to smaller values and decreased with increasing oxide content, while the Bloch constant was much bigger than that for bulk and increased significantly with oxide content. The value of coercivity decreased with increasing temperature, and this decrease was more pronounced for the nanoparticles containing high oxide content. The exchange anisotropy arising from the exchange coupling across the Ni75Fe25/oxide interfaces was examined and was used to interpret the observed temperature-dependent behaviors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 755: Symposium DD – Solid-State Chemistry of Inorganic Materials IV , 2002 , DD5.17
Copyright
Copyright © Materials Research Society 2003

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References

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