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Magnetic domain structures and perpendicular magnetic anisotropies for L10-ordered FePt alloy films have been investigated. The films were prepared by alternating Fe  and Pt  monatomic layers on MgO  substrates at low temperatures below 230°C. In addition to the fundamental  peak,  and  superlattice peaks have clearly been observed in the X-ray diffraction patterns, indicating the formation of an L10-ordered structure. The magnetization measurements show that all the samples are perpendicularly magnetized. Good magnetic squareness (Mr/Ms∼0.9) from the magnetization curves are obtained and highly interconnected stripe domain patterns are observed for the samples grown at Ts ≥ 160°C.