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Transport through (Ga, Mn) As nanoislands: Coulomb blockade and temperature dependence of the conductance

Schlapps, Markus; Lermer, Teresa; Geissler, Stefan; Neumaier, Daniel; Sadowski, Janusz LU ; Schuh, Dieter; Wegscheider, Werner and Weiss, Dieter (2009) In Physical Review B (Condensed Matter and Materials Physics) 80(12).
Abstract
We report on magnetotransport measurements of nanoconstricted (Ga, Mn) As devices showing very large resistance changes that can be controlled by both an electric and a magnetic field. Based on the bias voltage and temperature-dependent measurements down to the millikelvin range we compare the models currently used to describe transport through (Ga, Mn) As nanoconstrictions. We provide an explanation for the observed spin-valvelike behavior during a magnetic field sweep by means of the magnetization configurations in the device. Furthermore, we prove that Coulomb blockade plays a decisive role for the transport mechanism and show that modeling the constriction as a granular metal describes the temperature and bias dependence of the... (More)
We report on magnetotransport measurements of nanoconstricted (Ga, Mn) As devices showing very large resistance changes that can be controlled by both an electric and a magnetic field. Based on the bias voltage and temperature-dependent measurements down to the millikelvin range we compare the models currently used to describe transport through (Ga, Mn) As nanoconstrictions. We provide an explanation for the observed spin-valvelike behavior during a magnetic field sweep by means of the magnetization configurations in the device. Furthermore, we prove that Coulomb blockade plays a decisive role for the transport mechanism and show that modeling the constriction as a granular metal describes the temperature and bias dependence of the conductance correctly and allows to estimate the number of participating islands located in the constriction. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
80
issue
12
publisher
American Physical Society
external identifiers
  • wos:000270383300097
  • scopus:70350743208
ISSN
1098-0121
DOI
10.1103/PhysRevB.80.125330
language
English
LU publication?
yes
id
9f3020d0-ee1b-475b-805b-3db9a11bdee2 (old id 1489378)
date added to LUP
2009-10-22 11:46:37
date last changed
2017-01-01 05:54:55
@article{9f3020d0-ee1b-475b-805b-3db9a11bdee2,
  abstract     = {We report on magnetotransport measurements of nanoconstricted (Ga, Mn) As devices showing very large resistance changes that can be controlled by both an electric and a magnetic field. Based on the bias voltage and temperature-dependent measurements down to the millikelvin range we compare the models currently used to describe transport through (Ga, Mn) As nanoconstrictions. We provide an explanation for the observed spin-valvelike behavior during a magnetic field sweep by means of the magnetization configurations in the device. Furthermore, we prove that Coulomb blockade plays a decisive role for the transport mechanism and show that modeling the constriction as a granular metal describes the temperature and bias dependence of the conductance correctly and allows to estimate the number of participating islands located in the constriction.},
  author       = {Schlapps, Markus and Lermer, Teresa and Geissler, Stefan and Neumaier, Daniel and Sadowski, Janusz and Schuh, Dieter and Wegscheider, Werner and Weiss, Dieter},
  issn         = {1098-0121},
  language     = {eng},
  number       = {12},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Transport through (Ga, Mn) As nanoislands: Coulomb blockade and temperature dependence of the conductance},
  url          = {http://dx.doi.org/10.1103/PhysRevB.80.125330},
  volume       = {80},
  year         = {2009},
}