READ/WRITE CHARACTERISTICS OF ZERO FIELD MAMMOS

K. Mitani; H. Watanabe; N. Takagi; H. Noguchi; N. Mamiya; H. Terasaki; H. Awano; M. Sekine; M. Tani; O. Ishizaki; K. Shimazaki

doi:10.3379/tmjpn2001.2.279

K. Mitani, H. Watanabe, N. Takagi, H. Noguchi, N. Mamiya, H. Terasaki, H. Awano, M. Sekine, M. Tani, O. Ishizaki, K. Shimazaki

Author information

K. Mitani
Hypermedia Research Center, SANYO Electric Co., Ltd.
H. Watanabe
Hypermedia Research Center, SANYO Electric Co., Ltd.
N. Takagi
Hypermedia Research Center, SANYO Electric Co., Ltd.
H. Noguchi
Hypermedia Research Center, SANYO Electric Co., Ltd.
N. Mamiya
Hypermedia Research Center, SANYO Electric Co., Ltd.
H. Terasaki
Hypermedia Research Center, SANYO Electric Co., Ltd.
H. Awano
Development of Technology Division, Hitachi Maxell, Ltd.
M. Sekine
Development of Technology Division, Hitachi Maxell, Ltd.
M. Tani
Development of Technology Division, Hitachi Maxell, Ltd.
O. Ishizaki
Development of Technology Division, Hitachi Maxell, Ltd.
K. Shimazaki
Development of Technology Division, Hitachi Maxell, Ltd.

Keywords: MAMMOS, zero-field, magneto-optical disk, polarization, in-groove, groove width

JOURNAL FREE ACCESS

2002 Volume 2 Issue 4 Pages 279-284

DOI https://doi.org/10.3379/tmjpn2001.2.279

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Abstract

We have developed a magneto optical disk system, having the recording density of 7.1 Gbit/in², by using zero-field type MAMMOS technology and an in-groove structured disk with a 635 nm laser diode and a 0.60 N.A.objective lens. We demonstrated that the system has enough margins for read/write powers, tilt, detrack anddefocus. On the other hand, the dependence of polarization direction of the incident beam on read/write characteristics was a problem, but was solved by optimizing the groove width.

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