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Between Quantum and Classical: Evolution of Electron Magnetic Resonance with Growth of a Spin System Size

Published online by Cambridge University Press:  09 January 2014

Brittany Bates ,
James Hilton ,
Carl Bonner  and
Natalia Noginova
Brittany Bates
Affiliation:
Norfolk State University, Norfolk, Virginia, USA
James Hilton
Affiliation:
Cornell University, Ithaca, New York, USA
Carl Bonner
Affiliation:
Norfolk State University, Norfolk, Virginia, USA
Natalia Noginova
Affiliation:
Norfolk State University, Norfolk, Virginia, USA
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Abstract

Systems with a single or several coupled electron spins are commonly described with the quantum approach while ferromagnetic domains with millions of coupled spins are classical systems. Large spin clusters and superparamagnetic nanoparticles contain hundreds of coupled electron spins, and are on the boundary between classical and quantum behavior. Electron magnetic resonance observed in ultra-fine iron oxide nanoparticles (∼ 5 nm size) reveals several features which are typical for paramagnetic spins and absent in macroscopic systems, including multiple quantum transitions observed at H0/n, where n = 2, 3, 4 and H0 is the field of the main resonance. In order to better understand the transition from quantum to classical behavior and magnetization dynamics at the nanoscale, we study the evolution of the EMR signal with increase of the particle size in suspensions of magnetite nanoparticles. The experimental data are compared with numerical simulations.

Keywords

magneticferromagneticmagnetic properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1636: Symposium A – Film Silicon Science and Technology , 2014 , mrsf13-1636-u03-07
Copyright
Copyright © Materials Research Society 2014 

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References

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