Abstract
A new recording layer construction of a double layer perpendicular recording media is proposed. The recording layer is constituted of double layers, a high Hc (⊥) layer of the surface side and a low Hc (⊥) layer of the soft magnetic layer side. The recording sensitivity is improved without decreasing the reproduced voltage. Total thickness of the recording layer is set at 0.3 μm, and coercivities of the high and low Hc (⊥) layers are set at 650 Oe and 350 Oe, respectively.
The satisfactory result is explained by the reproduced voltage depending strongly on the coercivity of the recording layer of the surface side, but not of the soft magnetic layer side; the recording sensitivity then mostly depends on the average coercivity of the recording layer. This new recording layer construction is useful to secure degradation of the recording and over-write sensitivities accompanied by thinning of the main pole thickness of the recording head. The Double-Recording-Layer media reported here is also useful to improve the reproduced voltage of media, since the recording sensitivity is raised without decreasing the total thickness of the recording layer.
