Shinzo Tsuboi
NEC
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Publication
Featured researches published by Shinzo Tsuboi.
IEEE Transactions on Magnetics | 1997
Takahiro Korenari; Shinzo Tsuboi; Toshiyuki Okumura; Hisao Matsutera; K. Tagami
Track-edge noise has been analyzed to clarify track-edge noise mechanisms. Edge noise arises from two different regions: the bit edge where the magnetization direction is opposite to the previously dc-erased direction and the magnetic transition edge. The edge noise at low density is mainly due to the magnetic distribution at the bit edge. The transition edge noise increases with increasing recording density, and it becomes dominant at high-recording density for an oriented medium. On the other hand, the transition edge noise is almost constant with increasing recording density for an isotropic medium.
ieee international magnetics conference | 1995
Shinzo Tsuboi; Takahiro Korenari; Nobuyuki Ishiwata; Hisao Matsutera; K. Tagami
The effect of remanent magnetic flux density (B/sub r/) and magnetic layer thickness (/spl delta/) on offtrack noise characteristics in Co-Cr-Ta alloy thin films is investigated. It has been found that decreasing the value of B/sub r/ is a more effective method of improving offtrack noise characteristics than decreasing the value of /spl delta/. Offtrack noise is shown to be due to the fluctuations in the amplitude of readback waveforms, fluctuations which are caused by fluctuations in magnetic transition amplitude. It was observed, using a magnetic force microscope, that lower B/sub r/ media had sharp boundaries at the track edge regions and the magnetization was more uniform, compared with those of higher B/sub r/ media.
Journal of Magnetism and Magnetic Materials | 2001
Shinzo Tsuboi; Hisao Matsutera; Tsutomu Ishi; Nobuyuki Ishiwata; Keishi Ohashi
The read/write characteristics for perpendicular magnetic recording media of focused-ion-beam (FIB)-etched recording heads were investigated. It was found that the trailing edge of an FIB-etched head produces a higher gradient in the magnetic field perpendicular to the medium than a head which has not been etched. The signal-to-noise ratio of the medium increased with the FIB-etched write gap. A high-Bs and thin pole increased the magnetic fields gradient in the perpendicular direction, resulting in excellent read/write characteristics.
Journal of the Acoustical Society of America | 1990
Hirotaka Hokkyo; Shinzo Tsuboi; K. Tagami
Archive | 1998
Hirotaka Hokkyo; Shinzo Tsuboi
Archive | 2001
Ichiro Fujieda; Takashi Fukuchi; Shinzo Tsuboi
Archive | 2002
Kazuhiko Hayashi; Takashi Fukuchi; Shinzo Tsuboi; Ichiro Fujieda
Journal of The Magnetics Society of Japan | 1994
Shinzo Tsuboi; Takahiro Korenari; Nobuyuki Ishiwata; Kazuhiko Yamada; K. Tagami
Archive | 1998
Shinzo Tsuboi
Archive | 2003
Hitoshi Matsushima; Ken Sumiyoshi; Shinzo Tsuboi; 研 住吉; 眞三 坪井; 仁 松嶋