The influence of substrate texture on time decay of magnetization for Co alloy hard disk media

概要

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Substrate texture effect on thermal instability for Co alloy thin film media are investigated. The orientation ratio of CoCrTa (Pt) /Cr media was controlled by the mechanical texture of the Nip/Al substrates. Bulk magnetic properties, delta M curves and time decay of magnetization along both circumferential and radial directions were measured. The maximum magnetic viscosity coefficient calculated from time decay of magnetization along circumferential direction was higher than that of radial direction for mechanically textured sample, while being similar along both directions for non-textured sample. The magnetic viscosity coefficient along circumferenetial direction is smaller than that along radial direction when the reverse field is in the range of the demagnetization field for thin film recording media. This implies that film with high orientation ratio will be more thermally stable when it is not exposed to large external magnetic field.
社団法人電子情報通信学会の論文
1999-02-25