Abstract
We report the investigation of the static and dynamic magnetic properties of type-A MnAs∕Ga0.945Mn0.055As (001) bilayers. Static magnetization measurements show them to be ferromagnetically coupled with an exchange bias field of ∼340Oe. The magnetocrystalline anisotropy constants of the (Ga,Mn)As layer were determined by X-band ferromagnetic resonance (FMR) spectroscopy. The (Ga,Mn)As layers are magnetically inhomogeneous as evidenced by a strong broadening of the (Ga,Mn)As uniform mode linewidth. The MnAs FMR spectra reveal the presence of a small MnAs fraction with a different orientation.
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