Thermoelectric Characterization of Electronic Properties of GaMnAs Nanowires. (17th September 2012)

• Record Type: Journal Article
• Authors: Wu, Phillip M.; Paschoal, Waldomiro; Kumar, Sandeep; Borschel, Christian; Ronning, Carsten; Canali, Carlo M.; Samuelson, Lars; Pettersson, Håkan; Linke, Heiner
• Other Names: Borgstrom Magnus T. Academic Editor.
• Is Part Of: Journal of nanotechnology. Volume 2012(2012)
• Publication Date: 2012-09-17
• Subjects: Nanotechnology -- Periodicals; Nanotechnology; Nanotechnology; Periodicals; Periodicals; 620.5
• DOI: 10.1155/2012/480813
• Languages: English
• ISSNs: 1687-9503

Abstract

Abstract : 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 Ga0.95 Mn0.05 As 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.