MRヘッドと単層垂直媒体を用いた高密度磁気記録 (<特集>垂直磁気記録の進展)

概要

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Potential merits of perpendicular magnetic recording are discussed on the basis of the magnetic properties of Co-based alloys. The possibility of high-density magnetic recording has been investigated for a combination of single-layer perpendicular disk media with ring-head writing and MR-head reading. The noise characteristics of CoCr_<19>Pt_<10> media are improved by employing a CoCr_<35>/TiCr_<10> dua1 underlayer, by adding Ta to the magnetic layer, and by reducing the magnetic crystal grain diameter. A linear recording density (D_<50>) of 260 kFCI and an S_0/N ratio of over 30 dB are observed for low noise CoCr_<19>Pt_<10>Ta_2 perpendicular media using a flying-type MR head at a magnetic spacing of 40 nm. Side-writing and side-erasing can be reduced to below 0.2 μm by employing a narrow-gap write head with trimmed sharp track edges, which has the potential to realize a track density greater than 25kTPI. The recording areal density can thus be increased beyond the 10 Gb/in^2 level with the present recording system.
社団法人日本磁気学会の論文
1997-06-01