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Detecting dynamic signals of ideally ordered nanohole patterned disk media fabricated using nanoimprint lithography

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11 Author(s)
Oshima, H. ; Yamagata Fujitsu Ltd., Kou5004-2, Higashine 999-3701, Japan and Fujitsu Laboratories Ltd., 10-1 Morinosato-Wakamiya, Atsugi 243-0197, Japan ; Kikuchi, H. ; Nakao, Hiroshi ; Itoh, K.
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The authors have fabricated ideally ordered alumina nanohole patterned disk media via anodic oxidation and nanoimprint lithography with a thermoplastic resist. The ordered arrays of alumina nanoholes with 100 nm pitch, filled with Co by electrodeposition, were created over a macroscopically large area on a hard-disk substrate using these industrially applicable nanofabrication technologies. Stable flight of a perpendicular magnetic head above the media and perpendicular magnetic anisotropy of the Co nanopillars enable high-speed dynamic magnetic recording and playback. Dynamic periodic signals that matched the nanopillar periodicity were clearly observed after writing bit patterns, showing alternate reversal of magnetization of the nanopillars.

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Applied Physics Letters  (Volume:91 ,  Issue: 2 )