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发明公开
CN1841501A 盘装置 失效 - 权利终止

盘装置
摘要：
磁盘装置的外壳具有板状基底(10)和板状顶盖(12)，其中所述板状基底具有由软磁性材料形成的开口上表面，所述板状顶盖具有由软磁性材料形成的开口上表面并被附接到所述基底。被设置在所述外壳中的盘形记录介质(16)包括基片、在所述基片上形成的软磁性底层、以及磁记录层，所述磁记录层通过被覆盖在所述软磁性底层上形成，并具有垂直磁各向异性。形成的所述基底的厚度大于等于0.5mm，并且形成的所述顶盖的厚度大于等于0.25mm。所述基底和所述顶盖的相对磁导率大于等于700，并且其饱和通量密度大于等于1.4(T)。
摘要（英）：

According to one embodiment, a case of a magnetic disk device has a sheet-shaped base with an open upper surface formed of a soft magnetic material, and a sheet-shaped top cover with an open upper surface formed of a soft magnetic material and attached to the base. A disk-shaped recording medium arranged in the case comprises a substrate, a soft magnetic backing layer formed on the substrate, and a magnetic recording layer formed by being overlapped on the soft magnetic backing layer and having perpendicular magnetic anisotropy. The base is formed in a thickness of 0.5 mm or more and the top cover is formed in a thickness of 0.25 mm or more, respectively. The base and the top cover have a relative permeability of 700 or more and a saturation flux density of 1.4 (T) or more.

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