We demonstrate the synthesis of magnetite nanostripes on GaAs(100) through control of substrate processing and postgrowth annealing. The GaAs substrates were prepared by chemical and thermal treatments with a chevron-featured reflection high-energy electron diffraction (RHEED) pattern observed along the GaAs(100)[011] direction. This chevronlike pattern becomes less prominent after Fe growth but appears again after the oxidation of the Fe into magnetite. This is due to the formation of nanostripes on the GaAs(100). However, the magneto-optical Kerr effect (MOKE) measurements show the easy axis is along the direction. This may suggest that magnetoelastic coupling plays a more important role than that of shape anisotropy.
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