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Electron Spin Resonance in Magnetic Nanoparticles. Effects of Temperature and Interparticle Interactions

Published online by Cambridge University Press:  26 February 2011

Natalia Noginova ,
F. Chen ,
A. Andreyev ,
J. McClure ,
E. P. Giannelis ,
A. B. Bourlinos  and
V. A. Atsarkin
Natalia Noginova
Affiliation:
nnoginova@nsu.edu, NSU, Physics, 700 Park Ave, Norfolk, VA, 23504, United States, (757) 823 8047, (757) 823 9054
F. Chen
Affiliation:
fchen@nsu.edu, NSU, Norfolk, VA, 23504, United States
A. Andreyev
Affiliation:
andreyev@vt.edu, NSU, Norfolk, VA, 23504, United States
J. McClure
Affiliation:
jmcclure@nsu.edu, NSU, Norfolk, VA, 23504, United States
E. P. Giannelis
Affiliation:
epg2@cornell.edu, Cornell University, Ithaca, NY, 14853, United States
A. B. Bourlinos
Affiliation:
abourlinos@cornel.edu, Cornell University, Ithaca, NY, 14853, United States
V. A. Atsarkin
Affiliation:
atsarkin@cplire.ru, IRE, Moscow, 103907, Russian Federation
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Abstract

The electron spin resonance technique has been applied to study the magnetization dynamics in broad temperature range in both concentrated magnetic fluid and diamagnetically diluted systems containing superparamagnetic maghemite nanoparticles. The ESR spectrum demonstrates an interesting double feature shape with a narrow peak near g=2, as well as “forbidden” resonances in low fields, and reveals strong dependence on temperature and nanoparticle concentration. The longitudinal spin-relaxation time was estimated. To describe the overall spectrum shape, a “quantization” model is used which involves summation of the resonance transitions corresponding to various orientations of the particle magnetic moment.

Keywords

magneticnanoscaleelectron spin resonance
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 984: Symposium MM – Magnetic Resonance in Material Science , 2006 , 0984-MM05-03
Copyright
Copyright © Materials Research Society 2007

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