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We report on the magneto-optical spectroscopy and cathodoluminescence of aset of wurtzite (Ga,Mn)N epilayers with a low Mn content, grown by molecularbeam epitaxy. The sharpness of the absorption lines associated to the Mn$^{3+}$internal transitions allows a precise study of its Zeeman effect in bothFaraday and Voigt configurations. We obtain a good agreement if we assume adynamical Jahn-Teller effect in the 3d$^{4}$ configuration of Mn, and wedetermine the parameters of the effective Hamiltonians describing the$^{5}T\_{2}$ and $^{5}E$ levels, and those of the spin Hamiltonian in theground spin multiplet, from which the magnetization of the isolated ion can becalculated. On layers grown on transparent substrates, transmission close tothe band gap, and the associated magnetic circular dichroism, reveal thepresence of the giant Zeeman effect resulting from exchange interactionsbetween the Mn$^{3+}$ ions and the carriers. The spin-hole interaction is foundto be ferromagnetic

physical review. b, condensed matter and materials physics

Magneto-optical spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>Ga</mml:mi><mml:mo>,</mml:mo><mml:mi>Mn</mml:mi><mml:mo>)</mml:mo><mml:mi mathvariant="normal">N</mml:mi></mml:mrow></mml:math>epilayers

Magneto-optical spectroscopy of(Ga,Mn)Nepilayers