Takahiro Umada

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

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.

Effect of underlayer on soft magnetic properties of electroless plated CoFeNi films

The soft magnetic properties of electroless plated CoFeNi films were examined in terms of the underlayers. CoFeNi films on NiP underlayers had a high saturation flux density of 1.7 T and a small coercivity of less than approximately 300 A/m when the film thickness was more than 300 nm. With a thickness of less than 300 nm, however, the saturation flux density was significantly reduced, while the coercivity drastically increased. These properties could be improved by utilizing a NiFe underlayer, instead of a NiP underlayer, to improve the film structure around the interface between the CoFeNi film and the underlayer.

A novel stereoscopic 3D photographic technology with a stereo adapter attached to a monocular camera

This paper proposes a novel stereoscopic 3D photographic technology with a stereo adapter attached to a monocular camera. From a cameras image, we select left and right ones with an adaptive threshold based on an amount of light entering the camera. Furthermore, we correct distortion of the left and right images by utilizing a new criterion derived from correctness of searching directions. Consequently, an automatic stereoscopic 3D photographing can be achieved.