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Mobility of Charge Carriers in Dilute Magnetic Semiconductors

Published online by Cambridge University Press:  01 February 2011

Michael G. Foygel ,
James Niggemann  and
A. G. Petukhov
Michael G. Foygel
Affiliation:
michael.foygel@sdsmt.edu, SDSM&T, Physics, 501 St Joseph St, Rapid City, SD, 57701, United States, (605)394-1227
James Niggemann
Affiliation:
james.niggemann@hardrockers.sdsmt.edu, SDSMT, Rapid City, SD, 57701, United States
A. G. Petukhov
Affiliation:
andre.petukhov@sdsmt.edu, SDSM&T, Rapid City, SD, 57701, United States
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Abstract

We studied electrical transport in dilute magnetic semiconductors, which is determined by scattering of free carriers by localized magnetic moments. In our calculations of the scattering time and the mobility of the majority and minority-spin carriers we took into account both the effects of thermal spin fluctuations and of built-in spatial disorder of the magnetic atoms. These effects are responsible for the magnetic-field dependence of the mobility of the charge carriers. The application of the external magnetic field suppresses the thermodynamic spin fluctuations thus increasing the mobility. Simultaneously, depending on the type of the carriers and on parameters of the impurity potential, scattering by built-in spatial fluctuations of the atomic spins increases or decreases with the magnetic field. The latter effect is due to the change in the magnitude of the random local Zeeman splitting with the magnetic field. We discuss the role of the above effects on mobility and magnetoresistance of semiconductors where magnetic impurities are electrically active or neutral.

Keywords

magnetoresistance (magnetic)semiconductingalloy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 999: Symposium K – Novel Semiconductor Materials for Room-Temperature Ferromagnetism , 2007 , 0999-K01-07
Copyright
Copyright © Materials Research Society 2007

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