Abstract
We report a study of the effects of external magnetic field on the magnetic domain structure of a 250-nm-thick MnAs epitaxial film on GaAs (0 0 1). The surface topography and the magnetic-domain structures were investigated by atomic-force microscopy and magnetic-force microscopy, respectively. A self-organized periodic array of stripes, consisting of ferromagnetic α-MnAs and paramagnetic β-MnAs, were formed during the deposition. A complex magnetic-domain structure appears in the ferromagnetic α-phase region at the demagnetized state ( H=0 Oe). As the magnetic field increases, the magnetic-domain structure changes gradually, and reaches a completely saturated state at H=600 Oe. Especially, at H=300 Oe, the observed magnetic domain-wall distribution matches well with the topographic one.
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