Physics – Condensed Matter – Materials Science
Scientific paper
2002-12-09
Physics
Condensed Matter
Materials Science
3 pages, 4 figures, submitted to APL
Scientific paper
10.1063/1.1573369
We report on detailed investigations of the electronic and magnetic properties of ferromagnetic GaMnAs layers, which have been fabricated by low-temperature molecular-beam epitaxy. Superconducting quantum interference device measurements reveal a decrease of the Curie temperature from the surface to the GaMnAs/GaAs interface. While high resolution x-ray diffraction clearly shows a homogeneous Mn distribution, a pronounced decrease of the carrier concentration from the surface towards the GaMnAs/GaAs interface has been found by Raman spectroscopy as well as electrochemical capacitance-voltage profiling. The gradient in Curie temperature seems to be a general feature of GaMnAs layers grown at low-temperature. Possible explanations are discussed.
Avrutin Viktor
Bracht Hartmut
Brotzmann S.
Frank Stefan
Koeder A.
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