Observation of sphere resonance peak in ferromagnetic GaN:Mn

Seo, S. S. A.; Kim, M. W.; Lee, Y. S.; Noh, T. W.; Park, Y. D.; Thaler, G. T.; Overberg, M. E.; Abernathy, C. R.; Pearton, S. J.
June 2003
Applied Physics Letters;6/30/2003, Vol. 82 Issue 26, p4749
Academic Journal
We report temperature-dependent optical spectra of ferromagnetic Mn-doped GaN in a wide photon energy region of 5 meV-4 eV. Below the GaN gap, an absorption peak around 1.25 eV whose intensity increases at lower temperatures was observed. A composite medium theory, called the Maxwell-Garnett theory, shows that the absorption peak can be assigned to a sphere resonance from metallic particles embedded in a Mn-doped GaN matrix. We also report that the far-infrared absorption of Mn-doped GaN sample was very small. This result suggests that itinerant carrier-mediated ferromagnetism does not fully explain the observed magnetic properties.


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