Abstract
Abstract A mechanism of the enhanced ferromagnetic Curie temperature ( T C ) is proposed for (Ga,Mn)As digital ferromagnetic heterostructures (DFH) obtained by incorporating Mn delta-doping layer into GaAs based on the first-principles calculations. Our calculation shows a strong enhancement of T C for the DFH compared with that of random alloy with the same Mn concentration. In order to verify this enhancement mechanism of T C , we confirm that higher 3d density of states at the Fermi level upon delta-doping is responsible for the enhancement of T C due to the ferromagnetic double exchange interaction.
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