Annealing Effect of Equiatomic Co/Pt Alloy Films
R. Gontarz, T. Luciński
Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

L. Uba, S. Uba
Institute of Physics, Warsaw University Branch in Białystok, Lipowa 41, 15-424 Białystok, Poland

and Yu.V. Kudryavtsev
Institute of Metal Physics Ukr. AS, 36 Vernadsky st., 252142 Kiev, Ukraine
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Polycrystalline as-sputtered CoPt alloy films near the equiatomic composition were characterized as consisting of a disordered fcc phase with preferred texture along [111] orientation perpendicular to the film plane. The film annealing at 600°C/16 h induces the disorder-order phase transition confirmed by X-ray diffraction. As a result of the transition an appearance of the ordered tetragonal (fct) phase of AuCuI type with c/a = 0.974 is observed. The c-axis is the easy axis of magnetization. Both longitudinal and polar Kerr hysteresis loops reveal a dramatic increase in the coercivity from 0.1 to 4.5 kOe in annealed CoPt alloy films due to ordering.
DOI: 10.12693/APhysPolA.85.427
PACS numbers: 81.40.Ef, 75.70.Fr, 61.50.Ks