Ferromagnetism and Curie temperature of Vanadium-doped nitrides.
Electronic structures, exchange interaction mechanism between magnetic ions and Curie temperature of Vanadium-doped nitrides (AlN, GaN, and InN) are studied within KKR-LSDA-CPA. It is found that the ferromagnetic super-exchange interaction mechanism is dominant at low concentrations of Vanadium, but the anti-ferromagnetic super-exchange interaction appears and reduces the stabilization of ferromagnetism at sufficiently high concentrations (x > 0.10), especially for Vanadium-doped AlN and Vanadium-doped GaN. The estimation of the Curie temperature within the mean field approximation shows the Curie temperature of Vanadium-doped nitrides exceeding room temperature with a few constituents of Vanadium.
Dinh
Van An
VA
Department of Condensed Matter Physics, Nanoscience and Nanotechnology Center, The Institute of Scientific and Industrial Research, Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan. divan@cmp.sanken.osaka-u.ac.jp
Katayama-Yoshida
Hiroshi
H