傾斜パッド型SPT浮上ヘッドによるシリンダ状CoPtCr-SiO_2垂直二層膜媒体のR/W特性

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A cylindrical magnetic storage system was investigated and developed, using perpendicular double-layered media with several CoPtCr-SiO_2 recording layers and inclined-pad-type heads with a single-pole-type (SPT) writer designed for use with cylindrical media. The fabricated head was capable of stable flight over a rotating cylindrical medium. The inclined-pad-type head had almost the same linear velocity dependence of its flying characteristics as in the theoretical design, and is thought to be a potentially valuable component of cylindrical magnetic storage systems. Composite recording layers of CoPtCr-SiO_2/Ru/Pt/Ta deposited on a rotating cylindrical substrate with a soft magnetic underlayer (SUL) had coercivities of 3.9 kOe (medium #A) and 5.9 kOe (medium #B), controlled by varying the SiO_2 content, and a squareness ratio of around 1. These properties were almost the same as those of composite recording layers deposited on conventional disk substrates with SULs. The fundamental read/write characteristics of CoPtCr-SiO_2/CoZrNb perpendicular double-layered cylindrical media were measured and a D_<50> value of around 310 kFCI was obtained using medium #B and an SPT writer attached to the inclined-pad-type head. A reduction of the flying height and protective layer thickness is indispensable for further increasing the areal recording density while maintaining sufficient overwrite capability.
2006-05-01