Ferromagnetic GaAs/GaMnAs Core−Shell Nanowires Grown by Molecular Beam Epitaxy

GaAs/GaMnAs core−shell nanowires were grown by molecular beam epitaxy. The core GaAs nanowires were synthesized under typical nanowire growth conditions using gold as catalyst. For the GaMnAs shell the temperature was drastically reduced to achieve low-temperature growth conditions known to be cruci...

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Bibliographic Details
Published in:Nano letters 2009-11, Vol.9 (11), p.3860-3866
Main Authors: Rudolph, Andreas, Soda, Marcello, Kiessling, Matthias, Wojtowicz, Tomasz, Schuh, Dieter, Wegscheider, Werner, Zweck, Josef, Back, Christian, Reiger, Elisabeth
Format: Article
Language:English
Subjects:
Catalytic methods
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Magnetic properties and materials
Materials science
Methods of nanofabrication
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Physics
Quantum wires
Small particles and nanoscale materials
Studies of specific magnetic materials
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Summary:GaAs/GaMnAs core−shell nanowires were grown by molecular beam epitaxy. The core GaAs nanowires were synthesized under typical nanowire growth conditions using gold as catalyst. For the GaMnAs shell the temperature was drastically reduced to achieve low-temperature growth conditions known to be crucial for high-quality GaMnAs. The GaMnAs shell grows epitaxially on the side facets of the core GaAs nanowires. A ferromagnetic transition temperature of 20 K is obtained. Magnetic anisotropy studies indicate a magnetic easy axis parallel to the nanowire axis.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl9020717