The influence of annealing temperature and film thickness on structural and magnetic properties of Mn2.5Ga films were investigated in this work. The annealing temperature of 400°C was found to be the optimum condition to obtain the films with high perpendicular magnetic anisotropy (PMA) (Kueff= 7.8 × 106erg/cm3) and smooth surface (Ra¿ 0.15 nm). The PMA property was maintained in the 5 nm thick film, and deterioration of the PMA properties with decreasing film thickness can be ascribed to the tensile strain existed in the thin Mn2.5Ga films.
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Wu et al. (2010) studied this question.
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