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Perpendicular magnetic anisotropy and domain structure of L10-ordered FePt films fabricated by monatomic layer control

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6 Author(s)
T. Shima ; Inst. for Mater. Res., Tohoku Univ., Sendai, Japan ; T. Moriguchi ; S. Mitani ; K. Takanashi
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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 [001] and Pt [001] monatomic layers on MgO [001] substrates at low temperatures below 230°C. In addition to the fundamental [002] peak, [001] and [003] 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.

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IEEE Transactions on Magnetics  (Volume:38 ,  Issue: 5 )