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Large coercivity and granular structure of CoPt/SiO2 films

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6 Author(s)
Chen, Chen ; Res. Inst. for Sci. Meas., Tohoku Univ., Sendai, Japan ; Kitakami, Osamu ; Okamoto, Satoshi ; Shimada, Y.
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By post-annealing the as-prepared CoPt/SiO2 samples with the atomic ratio of Co: Pt=47.5: 52.5, high coercivity Hc≈14 kOe was obtained at room temperature. TEM and XRD revealed the ordered fct (L10) structure with the lattice constant ratio c/a=0.97 in the granular films with the average grain size around 10-20 nm. The grain size and packing density effect on coercivity are also discussed

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )