physica status solidi (b) · 2006 · 22 citations · 11 references
Natural SciencesMaterials EngineeringMaterials ScienceCondensed Matter PhysicsElectronic MaterialsSpectroscopyDopingElectron Paramagnetic ResonanceElectron Spin Resonance SpectroscopyMagnetic CharacterizationSpintronic MaterialsSpintronicsCharge States Of DefectsCharge-transfer StatesGallium Nitride (Gan) MaterialsIron-based SuperconductorsMagnetic Materials CharacterizationMagnetic SemiconductorsQuantum InterferenceSuperconducting Quantum Interference Device Magnetometry
Abstract Metal‐organic chemical vapour deposition of GaN:Fe and (Ga, Fe)N:Mg has been carried out in order to optimize the growth process and to investigate the effectiveness of Fe ions and Mg acceptors incorporation. All samples have been investigated via high‐resolution X‐ray diffraction, secondary‐ion mass spectroscopy, electron paramagnetic resonance (EPR) and magnetization measurements. Co‐doping of Fe and δ‐Mg has been found to promote the acceptors incorporation and EPR data, supported by superconducting quantum interference device magnetometry experiments, reveal the presence of Fe ions in two charge states, namely the Fe 3+ responsible for Curie paramagnetism and the Fe 2+ tentatively correlated to van Vleck paramagnetism. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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