Magnetism in Mn delta-doped cubic GaN: density-functional theory studies

Details Magnetism in Mn delta-doped cubic GaN: density-functional theory studies Magnetism in Mn delta-doped cubic GaN: density-functional theory studies

2009-01-19

arxiv.org/abs/0901.2820v1

Physics

Condensed Matter

Materials Science

13 pages, 3 figures, 36 references

Scientific paper

The magnetism in 12.5% and 25% Mn delta-doped cubic GaN has been investigated using the density-functional theory calculations. The results show that the single-layer delta-doping and half-delta-doping structures show robust ground state half-metallic ferromagnetism (HMF), and the double-layer delta-doping structure shows robust ground state antiferromagnetism (AFM) with large spin-flip energy of 479.0 meV per Mn-Mn pair. The delta-doping structures show enhanced two-dimensional magnetism. We discuss the origin of the HMF using a simple crystal field model. Finally, we discuss the antiferromagnet/ferromagnet heterostructure based on Mn doped GaN.

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