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Magnetic Characterization of CoFe2O4 Nanoparticles

Published online by Cambridge University Press:  01 February 2011

G. Lawes ,
B. Naughton ,
D. R. Clark ,
A. P. Ramirez  and
R. Seshadri
G. Lawes
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87544
B. Naughton
Affiliation:
Materials Department, UC Santa Barbara, Santa Barbara, CA 93106
D. R. Clark
Affiliation:
Materials Department, UC Santa Barbara, Santa Barbara, CA 93106
A. P. Ramirez
Affiliation:
Bell Laboratories, Lucent Technologies, 600 Mountain Ave, Murray Hill, NJ
R. Seshadri
Affiliation:
Materials Department, UC Santa Barbara, Santa Barbara, CA 93106
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Extract

We have synthesized CoFe2O4 nanoparticles with length scales ranging from 3.5 nm to 14.2 nm. We have characterized the magnetic properties of these samples using both DC and AC magnetization, and find some slightly anomalous behavior in two of the samples. We tentatively attribute these features to interactions between the magnetic nanoparticles.

There is a great deal of interest in understanding the physical basis for the magnetic properties of nanoparticles in order to facilitate their incorporation into a wide range of commercial applications. By studying the magnetic characteristics of CoFe2O4 nanoparticles using bulk measurement techniques, we are able to probe the properties of both the individual nanoparticles and interactions in these systems. In this report, we discuss our magnetic characterization of a series of CoFe2O4 nanoparticles grown using an aqueous co-precipitation technique. In addition to DC magnetization at fixed fields and temperatures, we also investigated the magnetic properties using AC susceptibility measurements. The long term goal of this research is to understand interparticle interactions in magnetic nanoparticles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 789 , 2003 , N9.8
Copyright
Copyright © Materials Research Society 2004

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References

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