Structure Characterization of FePd, FePt, and CoPt Alloy Thin Films Epitaxially Grown on SrTiO3(001) Single-Crystal Substrates

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FePd, FePt, and CoPt alloy epitaxial thin films are prepared on SrTiO3(001) single-crystal substrates at 600 ℃ by using an ultra-high vacuum radio-frequency magnetron sputtering system. L10 ordered phase formation is recognized for these films. The FePd film consists of L10(001) single-crystal with the c-axis perpendicular to the substrate surface, whereas the FePt and the CoPt films involve two L10(100) variants, whose c-axes are lying in-plane and rotated around the film normal by 90° each other, in addition to L10(001) variant. A higher long-range order degree is observed in the order of FePd (0.61) > FePt (0.35) > CoPt (0.16). The FePd film shows a perpendicular magnetic anisotropy, while the FePt and the CoPt films show in-plane magnetic anisotropies. The magnetic property is influenced by the c-axis direction and the order degree.
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