Nanostructure and magnetic properties of highly (001) oriented L10 (Fe49Pt51)1−xCux films

We report on nonepitaxially grown L10 Cu-alloyed FePt thin films with strong (001) texture. The FePt films with different Cu contents were deposited directly on Si wafers with a Fe49Pt51∕Cu multilayer structure. The Cu content was varied from 0to13at.%. All films were annealed at 600°C for 5min. X-ray-diffraction characterization showed that only one set of L10 diffraction peaks appeared and no elemental Cu diffraction peaks were visible. This result, along with a varying c∕a lattice-parameter ratio, suggests that Cu substitutes Fe or Pt in the L10 lattice and ternary FePtCu alloy films are formed. (001) texture was enhanced with the increase of Cu content. Transmission electron microscope images showed that the grain size of FePtCu was about 10nm. For FePt film with 11at.% Cu substitution, coercivity was about 5kOe, which is suitable for writing in a practical perpendicular-recording film.

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