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Grain isolated L10 FePtTa2O5 nanocomposite films with large coercivity for perpendicular recording applications

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7 Author(s)
Lim, B.C. ; Data Storage Institute, A*STAR (Agency for Science, Technology and Research), 5 Engineering Drive 1 (off Kent Ridge Crescent, NUS), Singapore 117608, Singapore ; Chen, J.S. ; Hu, J.F. ; Lwin, P.W.
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L10 FePtTa2O5 films with (001) texture were synthesized by cosputtering FePt and Ta2O5 targets and in situ heated at 350 °C. The (001) preferred orientation was preserved even when doped with 20 vol % Ta2O5. The out-of-plane coercivity, Hc, increased from 6.7 kOe (for pure FePt film) to 8.8 kOe when doped with 20 vol % Ta2O5. Further increase in the dopant content to 25 and 30 vol % caused Hc to decrease significantly to below 3 kOe. Well-isolated FePt grains of tall column structures were observed for the 12 nm thick FePt film when doped with 20 vol %. The loop slope parameter, α, of such FePt film approached 1.

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Journal of Applied Physics  (Volume:105 ,  Issue: 7 )