Berlin 2018 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 19: Quantum dots and wires: Transport properties
HL 19.3: Vortrag
Dienstag, 13. März 2018, 10:00–10:15, A 151
Magnetotransport measurements of single MnAs/InAs hybrid nanowires — •Patrick Uredat1, Ryutaro Kodaira2, Ryoma Horiguchi2, Shinjiro Hara2, Peter J. Klar3, and Matthias T. Elm1 — 1Center for Materials Research, Justus Liebig University, 35392 Giessen, Germany — 2Research Center for Integrated Quantum Electronics, Hokkaido University, Sapporo 060-8628, Japan — 3Institute for Experimental Physics I, Justus Liebig University, 35392 Giessen, Germany
III-V semiconducting nanowires are seen as building blocks for future nano-scaled optical or electrical devices. To be suitable for spintronic applications nanowires have to exhibit adjustable ferromagnetic properties. As the growth of diluted magnetic semiconductors is still challenging, MnAs/InAs hybrid nanowires may represent an alternative. MnAs/InAs hybrid nanowires are grown using selective-area MOVPE followed by endotaxial growth of MnAs nanoclusters. By varying temperature and time of this endotaxial growth process one can tune the shape as well as the number of nanoclusters. Structural analysis confirms high crystal quality of the hybrid nanowires, while magnetic force microscopy reveals the ferromagnetic properties of the MnAs nanoclusters. Magnetotransport measurements of pure InAs nanowires show quantum interference effects and a large positive magntoresistance effect. In contrast, MnAs/InAs hybrid nanowires exhibit a linear negative magnetoresistance effect. Furthermore, angle-dependent transport measurements indicate additional boundary scattering at intermediate temperatures due to the confined transport pathway.