Abstract
Using ab initio band structure calculations and symmetry arguments, we show that the magnetic property of is drastically different from TM-doped GaN. The coupling between Gd atoms in the alloy is antiferromagnetic, but the ferromagnetic phase can be stabilized by introducing electrons. Furthermore, we propose a model that may explain the recently observed colossal magnetic moments in this system, based on the polarization of donor electrons.
- Received 7 July 2005
DOI:https://doi.org/10.1103/PhysRevB.72.115201
©2005 American Physical Society