Open AccessThermoelectric Characterization of Electronic Properties of GaMnAs Nanowires
Author(s) -
Phillip M. Wu,
Waldomiro Paschoal,
Sandeep Kumar,
Christian Borschel,
Carsten Ronning,
C. M. Canali,
Lars Samuelson,
Håkan Pettersson,
Heiner Linke
Publication year - 2012
Publication title -
journal of nanotechnology
Language(s) - English
Resource type - Journals
eISSN - 1687-9511
pISSN - 1687-9503
DOI - 10.1155/2012/480813
Subject(s) - seebeck coefficient , materials science , spintronics , nanowire , condensed matter physics , doping , thermoelectric effect , characterization (materials science) , thermal conduction , conductance , atmospheric temperature range , thermoelectric materials , electron , spin (aerodynamics) , nanotechnology , optoelectronics , thermal conductivity , ferromagnetism , physics , thermodynamics , quantum mechanics , composite material
Nanowires with magnetic doping centers are an exciting candidate for the study of spin physics and proof-of-principle spintronics devices. The required heavy doping can be expected to have a significant impact on the nanowires' electron transport properties. Here, we use thermopower and conductance measurements for transport characterization of Ga0.95Mn0.05As nanowires over a broad temperature range. We determine the carrier type (holes) and concentration and find a sharp increase of the thermopower below temperatures of 120 K that can be qualitatively described by a hopping conduction model. However, the unusually large thermopower suggests that additional mechanisms must be considered as well
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