Improved Recording Resolution of Amorphous RE-TM Alloy Perpendicular Magnetic Recording Media

概要

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We developed TbFeCo perpendicular magnetic recording media by controlling their magnetic properties. The key to improve the recording resolution of a TbFeCo recording layer with a continuous film structure is the creation of modulated magnetic domain wall potential. The column structure, which causes modulation in magnetic domain wall potential, reflects the grain structure of the underlayer for the TbFeCo layer. A 10-nm-thick NiP underlayer with grains of 20 nm in diameter changed the magnetization reverse mode for single-layer TbFeCo perpendicular media, reduced zigzag domains, and improved recording resolution. We obtained clear magnetic recording patterns of 450 kilo flux changes per inch (kFCI) and a high signal-to-noise ratio with a conventional merge-type GMR head. We fabricated a 3-nm-thick multilayered intermediate layer with small uniform grains of 13 nm in diameter on an FeC soft magnetic backlayer for the double-layered TbFeCo perpendicular media. This intermediate layer resulted in improved recording resolution in the TbFeCo recording layer. The recording resolution D_<50> of a double-layered TbFeCo perpendicular medium with a multilayered intermediate layer was 275 kFCI, which is 100 kFCI higher than that of a double-layered TbFeCo perpendicular medium with a single-layer NiP intermediate layer.
社団法人日本磁気学会の論文
2003-08-01