Abstract
Vibrating Sample Magnetometer measurements were performed on a ferromagnetic (Ga,Mn)As thin film. We report Curie temperature (T-c) up to 142 K in an annealed 200 nm GaMnAs layer. This result is remarkable and comparable with the T-c obtained in GaMnAs for small thicknesses t < 50 nm. Our result reveals the high quality of the sample albeit the presence of 3 different chemical species, and a large thickness. After comparison with previous work obtained in GaMnAs, we show that for film of up to t=200 nm the out diffusion based annealing process is not thickness limited. (c) 2013 Elsevier B.V. All rights reserved.