Structural and magnetic properties of GaMnAs layers with high Mn-content grown by migration-enhanced epitaxy on GaAs(100) substrates

Sadowski, J.; Mathieu, R.; Svedlindh, P.; Domagala, J. Z.; Bak-Misiuk, J.; Swiatek, K.; Karlsteen, M.; Kanski, J.; Ilver, L.; Åsklund, H.; So¨dervall, U.
May 2001
Applied Physics Letters;5/21/2001, Vol. 78 Issue 21, p3271
Academic Journal
Ferromagnetic GaMnAs containing up to 10% Mn has been grown by migration-enhanced epitaxy at a substrate temperature of 150 °C. The lattice constant of hypothetical zinc-blende structure MnAs is determined to be 5.90 Å, 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. © 2001 American Institute of Physics.


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