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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 100nm 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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Oscillation of the reflection high-energy electron diffraction (RHEED) intensity has been observed during the MBE growth process of Ag on Ag(100) single crystals. The oscillation of the specular beam intensity is observed in the growth temperature range from 200 K to 480 K, but not observed above 500 K. Temperature dependence of the RHEED intensity oscillation is discussed on the basis of the step flow and roughening transition, and it is shown that the roughening transition is more important in the growth process of this system with high surface energy.

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