Ferromagnetism in cobalt doped n-GaN
S. Dhara, B. Sundaravel, K. G. M. Nair, R. Kesavamoorthy, M. C., Valsakumar, T. V. Chandrasekhar Rao, L. C. Chen, K. H. Chen
TL;DR
This paper reports ferromagnetism in cobalt-doped n-GaN, with a Curie temperature up to 250K, confirmed by various structural studies, suggesting carrier-mediated magnetic coupling.
Contribution
It demonstrates ferromagnetic ordering in Co-doped n-GaN with detailed structural analysis confirming substitutional Co incorporation.
Findings
Maximum Curie temperature of ~250K
Substitutional Co confirmed by x-ray emission-channeling
Carrier-mediated coupling explains ferromagnetism
Abstract
Ferromagnetic ordering is reported in the post-annealed samples of Co doped n-GaN formed by Co+ implantation. A maximum Curie temperature ~ 250K is recorded for the sample with 8 atomic percent Co. Particle induced x-ray emission-channeling study confirmed the substitutional Co in Ga lattice site. Local atomic arrangement around magnetic impurities is also analyzed using Raman study. A disordered model with carrier mediated coupling of localized magnetic moments is made responsible for the observed ferromagnetic ordering.
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