Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 69: Quantum Dots: Transport Properties I
HL 69.1: Vortrag
Donnerstag, 23. März 2017, 09:30–09:45, POT 151
Transport properties of ferromagnetic-semiconducting hybrid nanowires with well-defined MnAs nanocluster properties — •Matthias T. Elm1, Ryutaro Kodaira2, Ryoma Horiguchi2, Kyohei Kabamoto2, Shinjiro Hara2, and Peter J. Klar1 — 1I. Physikalisches Institut, Justus Liebig University, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany — 2Research Center for Integrated Quantum Electronics, Hokkaido University, Sapporo 060-8628, Japan
For the realization of nano-spintronic devices current research focuses on the preparation and characterization of dilute magnetic semiconducting III-V nanowires. An alternative are hybrid nanowires with ferromagnetic nanoclusters, which exhibit well-defined magnetic and structural properties. Here we present the structural and electrical characterization of MnAs/InAs nanowire hybrids, which are prepared by selective-area growth of the nanowires followed by the endotaxy of MnAs nanoclusters. By varying the growth conditions, size, distribution and number of nanoclusters can be accurately controlled. Using SEM, EDX, HR-TEM as well as MFM, the structural and magnetic properties of the nanoclusters were investigated. First magnetotransport measurements reveal the large impact of the clusters on the transport properties in the nanowires. While single InAs nanowires show universal conductance fluctuations as well as a large positive magnetoresistance at low temperatures, a linear negative magnetoresistance is observed for hybrid nanowires with MnAs clusters completely penetrating the nanowires.