Over a wide temperature range of 30 °C around room temperature, MnAs films on GaAs(001) semiconductor substrates break up into ordered arrays of submicron-sized ferromagnetic α and paramagnetic β wires. Both the hard and the easy axis of magnetization (perpendicular to the wires) lie in the film plane and a large variety of complex domain patterns are found in micromagnetic investigations with magnetic force microscopy (MFM). A systematic analysis of the domain configurations is given and the most likely configurations are identified through MFM contrast simulations.

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