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Magnetooptical properties of (Ga,Fe)N layers

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arxiv 1308.3512 v1 pith:6QLFJEMA submitted 2013-08-15 cond-mat.mtrl-sci

Magnetooptical properties of (Ga,Fe)N layers

J. Papierska , J.-G. Rousset , W. Pacuski , P. Kossacki , A. Golnik , M. Nawrocki , J. A. Gaj , J. Suffczy\'nski
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I. Kowalik W. Stefanowicz M. Sawicki T. Dietl A. Navarro-Quezada B. Faina Tian Li A. Bonanni
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classification cond-mat.mtrl-sci
keywords layersnanocrystalscontributionfe-richferromagneticmagneticmagnetoopticalparamagnetic
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Magnetooptical properties of (Ga,Mn)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 grow 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 (MCD). Possible reasons for differences in magnetic response determined by MCD and SQUID measurements are discussed.

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