Ferromagnetic GaMnAs/GaAs superlattices - MBE growth and magnetic properties

Details Ferromagnetic GaMnAs/GaAs superlattices - MBE growth and magnetic properties Ferromagnetic GaMnAs/GaAs superlattices - MBE growth and magnetic properties

2001-12-14

arxiv.org/abs/cond-mat/0112264v1

Thin Solid Films 412, 122 (2002)

Physics

Condensed Matter

Materials Science

Proceedings of 4th International Workshop on Molecular Beam Epitaxy and Vapour Phase Epitaxy Growth Physics and Technology, Se

Scientific paper

10.1016/S0040-6090(02)00323-1

We have studied the magnetic properties of (GaMnAs)m/(GaAs)n superlattices with magnetic GaMnAs layers of thickness between 8 and 16 molecular layers (ML) (23-45 \AA), and with nonmagnetic GaAs spacers from 4 ML to 10 ML (11-28 \AA). While previous reports state that GaMnAs layers thinner than 50 \AA are paramagnetic in the whole Mn composition range achievable using MBE growth (up to 8% Mn), we have found that short period superlattices exhibit a paramagnetic-to-ferromagnetic phase transition with a transition temperature which depends on both the thickness of the magnetic GaMnAs layer and the nonmagnetic GaAs spacer. The neutron scattering experiments have shown that the magnetic layers in superlattices are ferromagnetically coupled for both thin (below 50 \AA) and thick (above 50 \AA) GaMnAs layers.

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