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We investigated the thermal evolution of the magnetic properties of MnAsepitaxial films grown on GaAs(001) during the coexistence ofhexagonal/orthorhombic phases using polarized resonant (magnetic) soft X-rayscattering and magnetic force microscopy. The results of the diffuse satelliteX-ray peaks were compared to those obtained by magnetic force microscopy andsuggest a reorientation of ferromagnetic terraces as temperature rises. Bymeasuring hysteresis loops at these peaks we show that this reorientation iscommon to all ferromagnetic terraces. The reorientation is explained by asimple model based on the shape anisotropy energy. Demagnetizing factors werecalculated for different configurations suggested by the magnetic images. Wenoted that the magnetic moments flip from an in-plane mono-domain orientationat lower temperatures to a three-domain out-of-plane configuration at highertemperatures. The transition was observed when the ferromagnetic stripe width Lis equal to 2.9 times the film thickness d. This is in good agreement with theexpected theoretical value of L = 2.6d.Comment: 16 pages in PD

Magnetic reconfiguration of MnAs∕GaAs(001) observed by magnetic force microscopy and resonant soft x-ray scattering