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Solid Phase Epitaxy of Ferromagnetic MnAs Layer and Quantum Dots on Annealed GaMnAs

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Sadowski J., Kanski J., Adell M., Domagała J., Janik E., Łusakowska E., Brucas R., Hanson M.

Acta Physica Polonica A

2005

vol. 108

issue 5

851-858

We show that post growth annealing of GaMnAs under As capping at temperatures in the range of 180-210ºC leads to significant surface modifications. Depending on GaMnAs layer thickness and composition, we obtain either a smooth continuous reacted (MnAs) surface layer or 3D islands (quantum dots). The surface modifications are due to a solid phase epitaxial process, in which Mn interstitials diffusing to the GaMnAs surface are bound with the As.

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1 Acta Physica Polonica A

1 2005

1 Adell M.

1 Brucas R.

1 Domagała J.

1 Hanson M.

1 Janik E.

1 Kanski J.

1 Sadowski J.

1 Łusakowska E.

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Solid Phase Epitaxy of Ferromagnetic MnAs Layer and Quantum Dots on Annealed GaMnAs