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Magnetic and Transport Properties of Ga1-xMnxAs, a New III-V Diluted Magnetic Semiconductor

Published online by Cambridge University Press:  15 February 2011

A. Van Esch ,
L. Van Bocksta ,
J. De Boeck ,
G. Verbanck ,
A. Van Steenbergen ,
R. Bogaerts ,
F. Herlach  and
G. Borghs
A. Van Esch
Affiliation:
Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, B-3001 Leuven, Belgium IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
L. Van Bocksta
Affiliation:
Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, B-3001 Leuven, Belgium
J. De Boeck
Affiliation:
IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
G. Verbanck
Affiliation:
Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, B-3001 Leuven, Belgium
A. Van Steenbergen
Affiliation:
High Field Magnet Laboratory, University of Nijmegen, Nijmegen, The Netherlands
R. Bogaerts
Affiliation:
Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, B-3001 Leuven, Belgium
F. Herlach
Affiliation:
Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, B-3001 Leuven, Belgium
G. Borghs
Affiliation:
IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
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Abstract

Ga1-xMnxAs is a new III-V diluted magnetic semiconductor that can be grown by MBE with Mn concentrations up to x ∼ 0.09. Below a critical temperature Tc, determined by the Mn concentration (about 50 K for x = 0.05) the material becomes ferromagnetic. This is attributed to the magnetic long-range order of Mn-hole complexes, the latter being the result of the strong antiferromagnetic interaction between the holes and Mn 3d spins. Transport and magnetic properties of the Ga1-xMnxAs system are strongly correlated. Above Tc, all samples show transport behaviour characteristic for materials near the metal insulator transition. Below Tc, resistivity decreases as the magnetic ordering sets in. When the magnetisation has reached its saturation value (below ∼ 20 K), variable range hopping is the main transport mechanism. Also, a negative magnetoresistance is observed below Tc.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 475: Symposium M – Magnetic Ultrathin Films, Multilayers, and Surfaces – 1997 , 1997 , 463
Copyright
Copyright © Materials Research Society 1997

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References

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