Abstract
Using density-functional theory, we study the magnetic stability of the Ga1−xMnxN alloy system. We show that unlike Ga1−xMnxAs, which shows only ferromagnetic phase, Ga1−xMnxN can be stable in either ferromagnetic or antiferromagnetic phases depending on the alloy concentration. The magnetic order can also be altered by applying pressure or with charge compensation. A band-structure model is used to explain these behaviors.
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