| 摘要 |
A thin film magnetic recording medium, comprising:at least one ferromagnetic thin film recording layer comprising magnetic particles with substantially uniform barriers to magnetization reversal, formed by a process comprising steps of:(a) providing a precursor structure including at least one ferromagnetic thin film recording layer having a surface and a first, higher coercivity which may be greater than that which permits writing of the precursor structure, comprising magnetic particles having a distribution of energy barriers to magnetization reversal; and(b) uniformly bombarding the entire surface of the precursor structure with particles of sufficient dosage and energy to:(i) substantially equalize the energy barriers to magnetization reversal of the magnetic particles;(ii) lower the coercivity of the at least one ferromagnetic thin film recording layer from the first, higher coercivity to a second, lower coercivity within a range of coercivities permitting writing of the bombarded at least one recording layer;(iii) substantially retain the signal decay behavior of the precursor structure; and(iv) limit the reduction in signal-to-medium noise ratio (SMNR) of the precursor structure to a pre-selected small amount.
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