ACTA

Magnetooptical Properties of (Ga,Fe)N Layers

J. Papierska^a, J.-G. Rousset^a, W. Pacuski^a, P. Kossacki^a, A. Golnik^a, M. Nawrocki^a, J.A. Gaj^a, J. Suffczyński^a, I. Kowalik^b, W. Stefanowicz^b, M. Sawicki^b, T. Dietl^{a, b}, A. Navarro-Quezada^c, B. Faina^c, T. Li^c and A. Bonanni^c

^aFaculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
^bInstitute of Physics, Polish Academy of Sciences, Warsaw, Poland
^cJohannes Kepler University of Linz, Austria

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Magnetooptical properties of (Ga,Fe)N layers containing various concentrations of Fe-rich nanocrystals embedded in paramagnetic (Ga,Fe)N layers are reported. Previous studies of such samples demonstrated that magnetization consists of a paramagnetic contribution due to substitutional diluted Fe ions as well as of ferromagnetic and antiferromagnetic components originating from Fe-rich nanocrystals, whose relative abundance can be controlled by the growth conditions. The nanocrystals are found to broaden and to reduce the magnitude of the excitonic features. However, the ferromagnetic contribution, clearly seen in SQUID magnetometry, is not revealed by magnetic circular dichroism. Possible reasons for differences in magnetic response determined by magnetic circular dichroism and SQUID measurements are discussed.

DOI: 10.12693/APhysPolA.120.921
PACS numbers: 75.50.Pp, 75.30.Hx, 78.20.Ls, 71.35.Ji