Abstract
A combined first-principles total energy Monte Carlo method is used to study the Curie temperature and its evolution in (Ga,Mn)As. The inter- and intra-cluster magnetic interactions are treated separately in a modified Heisenberg Hamiltonian. We find for random Mn distributions (mimicking as-grown samples) a maximum at the Mn concentration of 6%. During annealing we show that a slow clustering process of substitutional Mn atoms takes place and reduces . Our calculated temporal evolution of during annealing agrees closely with experiment.
- Received 2 June 2006
DOI:https://doi.org/10.1103/PhysRevB.74.195337
©2006 American Physical Society