Journal
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
Volume 31, Issue 10, Pages 3251-3254Publisher
SPRINGER
DOI: 10.1007/s10948-018-4595-x
Keywords
FePt; Thin film; Coercivity; Texture
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L1(0)-FePt/[Fe/Pt](27) multilayer films were prepared on (100)-oriented single-crystal MgO substrates. Structural analysis indicates epitaxial growth of the L1(0)-FePt films during high-temperature deposition. The room-temperature-deposited [Fe/Pt](27) multilayer exhibits the fcc-FePt structure grown epitaxially on the L1(0)-FePt base layer. The degree of chemical order and thereby the anisotropy of the top layer has been controlled by varying the temperature of a post-deposition annealing process. Compared with the as-deposited films, coercivities of the films annealed below 400 degrees C are substantially decreased by introducing the formation of a graded anisotropy in the partially ordered top layer. Coercivities decrease for annealing temperatures that are greater than 400 degrees C due to improved ordering of the top layer.
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