Schlapps, Markus and Geissler, Stefan and Lermer, Teresa and Sadowski, Janusz and Wegscheider, Werner and Weiss, Dieter (2010) Coulomb blockade transport across lateral (Ga,Mn)As nanoconstrictions. Physica E Low-dimensional Systems and Nanostructures 20 (10), pp. 2676-2680.
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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-valve like 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.
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss|
Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Keywords:||Magnetic-semiconductor structures; Nanoscale contacts; Coulomb blockade; Single electron devices; Transport and tunneling; Magnetotransport phenomena|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||21 Jan 2011 14:48|
|Last Modified:||21 Jan 2011 14:48|
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