Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 85: Poster Session II
HL 85.107: Poster
Donnerstag, 17. März 2011, 18:00–21:00, P4
Magnetotransport on ferromagnetiv (Ga,Mn)As/GaAs core-shell nanowires — •Christian Butschkow1, Stefan Geissler1, Andreas Rudolph1, Marcello Soda1, Elisabeth Reiger1, Dieter Schuh1, Werner Wegscheider2, and Dieter Weiss1 — 1Institute for Experimental and Applied Physics, Universität Regensburg, Universitätsstraße 31, 93053 Regensburg — 2Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland
We performed magnetotransport measurements on individually contacted GaAs/(Ga,Mn)As nanowires at low temperatures. The core nanowires were grown by MBE using gold as catalyst at a temperature of 530∘C. For the (Ga,Mn)As shell growth, the substrate temperature was decreased to 205∘C. A Curie-Temperature of 17K to 20K was observed by SQUID measurements on an ensemble of 108 nanowires as well as by transport measurements. Investigating the magnetoresistance effects for various field directions we can determine the magnetic anisotropy to be strongly uniaxial with a magnetic easy axis pointing along the nanowire axis. The observed effects are very pronounced when compared to (Ga,Mn)As bulk material with a similar manganese concentration. Also the anisotropy field and coercive fields are significantly larger than for (Ga,Mn)As bulk material.