Akimasa Kaizu
TDK
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Publication
Featured researches published by Akimasa Kaizu.
IEEE Transactions on Magnetics | 2003
Yoshikazu Soeno; Makoto Moriya; Kuniyasu Ito; Kazuhiro Hattori; Akimasa Kaizu; Tsutomu Aoyama; Mikio Matsuzaki; Hiroshi Sakai
In conventional hard disk drive signal recording, the track pitch and the track density depend mainly on the write/read width of the magnetic head. In order to increase the track density, a narrow head is needed. We are developing a discrete track media with perpendicular anisotropy to evaluate the capability of high recording density. The tracks are separated physically by the groove. Then, the recording width and the track pitch are defined precisely by the tracks formed on the media. It is expected to have some features for high track density recording. The recording track fluctuation during the writing process and the magnetic interference from adjacent tracks are reduced. Also, the recording signal at the write-pole-edge is improved, and so on. We fabricated an actual discrete track perpendicular medium to evaluate the basic write/read properties. The measurements have been carried out on a spin-stand. The capability of this media at high track density are discussed.
ieee international magnetics conference | 2005
Yoshikazu Soeno; Makoto Moriya; Akimasa Kaizu; Mitsuru Takai
In this paper, the evaluation results of the performance of discrete track perpendicular media is described. Discrete track patterns for data area and servo patterns such as address marks and burst patterns for each sector are formed by nano-imprint lithography and the dry etching process. Comparison of the error rate profile in both the discrete track media and conventional media is shown. Write and read operations are conducted by a perpendicular magnetic head which has MWW of 195 nm and MRW of 100 nm. In the conventional media, the error rate of the center-track is degraded due to the side-writing and cross talk. On the other hand, in the discrete track media, the error rate is kept unchangeable. This is because the grooves between the tracks prevent the side-writing and cross talk. In addition, higher SNR is observed at the narrower track pitch in the discrete track media.
ieee international magnetics conference | 2006
Akimasa Kaizu; Yoshikazu Soeno; Mitsuru Takai; Katsumichi Tagami; Isamu Sato
The off-track-capability (OTC) of the discrete track perpendicular medium is investigated by using Landau-Lifshitz-Gilbert micromagnetic simulation. The OTC is very important to design the system of the HDD. In this simulation, the OTC of the read head, the OTC of the write head and the OTC where both the read head and the write head have off-track are shown from the point of signal-to-noise ratio (SNR). The simulation results show that the discrete track medium has superior advantage on the OTC for both reading and writing process
IEEE Transactions on Magnetics | 2003
Susumu Haratani; Akimasa Kaizu; Isamu Sato
In this paper, the benefit to separate each track and the feasibility to increase track density are investigated by using Landau-Lifshits-Gilbert micromagnetic model. A MFM image of the discrete patterned media recorded at 50 kFCL is shown. In the recording process, the single pole write head with a width, Pw, of 200 nm and a thickness, Pt, of 300 nm is used.
Archive | 2005
Akimasa Kaizu; Makoto Moriya; Yoshikazu Soeno
Archive | 2004
Akimasa Kaizu; Yoshikazu Soeno
Archive | 2005
Akimasa Kaizu; Yoshikazu Soeno; Makoto Moriya
Archive | 2009
Akimasa Kaizu; Satoshi Tomikawa; Yoshikazu Soeno
Archive | 2012
Tatsuhiro Kobayashi; Yoshikazu Soeno; Akimasa Kaizu
Archive | 2013
Tsutomu Aoyama; Yoshikazu Soeno; Akimasa Kaizu