Journal
APPLIED PHYSICS LETTERS
Volume 78, Issue 21, Pages 3271-3273Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1370535
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Ferromagnetic GaMnAs containing up to 10% Mn has been grown by migration-enhanced epitaxy at a substrate temperature of 150 degreesC. The lattice constant of hypothetical zinc-blende structure MnAs is determined to be 5.90 Angstrom, which deviates somewhat from previously reported values. This deviation is ascribed to growth-condition-dependent density of point defects. Magnetization measurements showed an onset of ferromagnetic ordering around 75 K for the GaMnAs layer with 10% Mn. This means that the trend of falling Curie temperatures with increasing Mn concentrations above 5.3% is broken. (C) 2001 American Institute of Physics.
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