Abstract
We report a systematic study of ferromagnetic resonance in granular GaAs:Mn/MnAshybrids grown on GaAs(001) substrates by metal–organic vapour-phase epitaxy. Theferromagnetic resonance of the MnAs clusters can be resolved at all temperatures belowTc. An additional broad absorption is observed below 60 K and is ascribed to localized chargecarriers of the GaAs:Mn matrix. The anisotropy of the MnAs ferromagnetic resonance fieldoriginates from the magneto-crystalline field and demagnetization effects of theferromagnetic MnAs clusters embedded in the GaAs:Mn matrix. Its temperaturedependence basically scales with magnetization. Comparison of the observed angulardependence of the resonance field with model calculations yields the preferentialorientation and shape of the clusters formed in hybrid layers of different thickness(150–1000 nm) grown otherwise at the same growth conditions. The hexagonal axes of theMnAs clusters are oriented along the four cubic GaAs space diagonals. Thin layerscontain lens-shaped MnAs clusters close to the surface, whereas thick layers alsocontain spherical clusters in the bulk of the layer. The magnetic properties of thehexagonal MnAs clusters can be tuned by a controlled variation of the cluster shape.
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