Ferromagnetism in cobalt-doped n-GaN

Ferromagnetism in cobalt-doped n-GaN

Ferromagnetic ordering is reported in the postannealed samples of Co doped n-GaN formed by Co+ implantation. A maximum Curie temperature ∼250K is recorded for the sample with 8at.% Co. Particle induced x-ray emission–channeling study confirmed the substitutional Co in Ga lattice site. Local atomic a...

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Veröffentlicht in:Applied physics letters 2006-04, Vol.88 (17)
Hauptverfasser: Dhara, S., Sundaravel, B., Nair, K. G. M., Kesavamoorthy, R., Valsakumar, M. C., Chandrasekhar Rao, T. V., Chen, L. C., Chen, K. H.
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Sprache:eng
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Zusammenfassung:Ferromagnetic ordering is reported in the postannealed samples of Co doped n-GaN formed by Co+ implantation. A maximum Curie temperature ∼250K is recorded for the sample with 8at.% 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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2194347