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The addition effects of Pt in the (0002) Ru underlayer were studied. It was found that the lattice parameter can be tuned as desired through Pt addition in a (0002)-oriented Ru layer. The out-of-plane and in-plane lattice parameter of the RuPt can be increased by 2.3% and 0.44%, respectively. No phase segregation was apparently observed in RuPt films under these process conditions even with a very high Pt content (39%). The RuPt layer thus provides a good template layer to study the Pt addition effects in (0002)-textured hcp Co alloy perpendicular media with a very wide range of Pt content. CoCrPt–SiO₂films were deposited with a Pt addition level varying from 15% to 40% on an optimally designed RuPt underlayer. The magnetic results showed thatH_ k, H_ c, K_ ureached a plateau at about 19%–23% Pt content. The maximum values forH_ k, H_ c, andK_ uare 16.0 kOe, 6.6 kOe, and3.1 times 10⁶erg/cm³, respectively.
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Shen et al. (2006) studied this question.
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