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Colossal Hopping Magnetoresistance of GaAs/ErAs Nanocomposites

Published online by Cambridge University Press:  21 February 2011

A. G. Petukhov ,
M. Foygel  and
A. Chantis
A. G. Petukhov
Affiliation:
Department of Physics, South Dakota School of Mines and Technology, Rapid City, D 57701-3995
M. Foygel
Affiliation:
Department of Physics, South Dakota School of Mines and Technology, Rapid City, D 57701-3995
A. Chantis
Affiliation:
Department of Physics, South Dakota School of Mines and Technology, Rapid City, D 57701-3995
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Abstract

A theory of bound magnetic polaron (BMP) hopping, driven by thermodynamic fluctuations of the local magnetization, has been developed. It is based on a two-site model of BMP's. The BMP hopping probability rate was calculated in the framework of the “Golden Rule” approach by using the Ginzburg-Landau effective Hamiltonian method. The theory explains the main features of hopping resistivity observed in a variety of experiments in dilute magnetic semiconductors and magnetic nanocomposites, namely: (a) negative giant magnetoresistance, the scale of which is governed by a magnetic polaron localization volume, and (b) low magnetic field positive magnetoresistance, which usually preceeds negative magnetoresistance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 629
Copyright
Copyright © Materials Research Society 2000

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References

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