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Magnetic Response of Iron Oxide Nanoparticles as Measured by AC Faraday Rotation

Published online by Cambridge University Press:  25 July 2013

Maarij Syed  and
John Moore
Maarij Syed
Affiliation:
Department of Physics & Optical Engineering, Rose-Hulman Institute of Technology, Terre Haute, IN 47803, U.S.A.
John Moore
Affiliation:
Department of Physics & Optical Engineering, Rose-Hulman Institute of Technology, Terre Haute, IN 47803, U.S.A.
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Abstract

Metal ferrite nanoparticles are of considerable technological and theoretical interest. Magnetic response of these systems is a function of various system properties like saturation magnetization, growth orientation, average particle size and size distribution, volume concentration, etc. [1]. This preliminary study investigates the magnetization dynamics (and thereby the Verdet constant) of aqueous Fe3O4 nanoparticle solutions through precision AC measurements of the Faraday Rotation (FR) at 633 nm for three different Fe3O4 nanoparticle solutions that are all prepared to have the same average particle size (∼10 nm) but differing saturation magnetization values. For each of these nanoparticle solutions precision measurements for FR are carried out over a given range of volume concentrations. The study shows simple linear dependence of FR on volume concentration and a more involved dependence on saturation magnetization. Some preliminary results relating to the frequency dependence of Verdet constants are also presented. Future directions for this work are also discussed. It is hoped that that these results will help in the development of better models to characterize response of these technologically and fundamentally useful systems.

Keywords

nanoscalemagnetic propertiesoptical properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1552: Symposium S – Nanostructured Metal Oxides for Advanced Applications , 2013 , pp. 59 - 64
Copyright
Copyright © Materials Research Society 2013 

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