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Kerr effect of ordered and disordered Fe1-xPtx(001) alloy films

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4 Author(s)
Y. M. Hu ; Dept. of Electr. Eng., Nan-Jeon Junior Coll. of Technol. & Commerce, Tainan, Taiwan ; J. C. A. Huang ; S. Y. Huang ; T. H. Wu

The (001) oriented Fe1-xPtx alloy films have been grown on Pt seeding layers on MgO(001) substrates by MBE. At growth temperature of 500°C, rather ordered structures were formed for FePt, FePt2, and FePt3 films, which exhibit large perpendicular magnetic anisotropy and Kerr rotations. In contrast, Fe 2Pt and Fe3Pt films were poorly ordered and did not display perpendicular magnetization for similar growth conditions. The optimal growth temperature of the FePt (x=0.5) alloys occurs at about 500°C, and the surface order-disorder transition occurs above 650°C. We demonstrate that chemical ordering is important for perpendicular magnetic anisotropy and Kerr effects for Fe1-xPtx alloy films, which in turn depend strongly on the alloy composition and growth temperature

Published in:

IEEE Transactions on Magnetics  (Volume:37 ,  Issue: 4 )