How to make GaMnAs with a high ferromagnetic phase transition temperature?

Sadowski, J.; Domagala, J. Z.; Kanski, J.; Rodriguez, C. H.; Terki, F.; Charar, S.; Maude, D.

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How to make GaMnAs with a high ferromagnetic phase transition temperature?

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Maude, D.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Sadowski, J., Domagala, J. Z., Kanski, J., Rodriguez, C. H., Terki, F., Charar, S., et al. (2006). How to make GaMnAs with a high ferromagnetic phase transition temperature? Materials Science, 24(3), 617-625.

Cite as: https://hdl.handle.net/21.11116/0000-000E-FBC0-E

Abstract

We analyse the role of structural defects in GaMnAs and demonstrate how
their density can be drastically reduced by in situ post-growth
annealing under As capping. Modifications of the magnetic, transport,
and structural properties of annealed GaMnAs layers are presented. The
main result is that Curie temperatures are strongly increased relative
to those of as-grown layers, typically from 70-80 K to 150-160 K. The
annealed layers exhibit well-ordered smooth surfaces, suitable for
further epitaxial overgrowth.