High density recording with a super resolution magneto-optical disk using magnetic field modulation method

1995 ◽  
Vol 56 (11) ◽  
pp. 1535-1541
Author(s):  
Y. Murakami ◽  
A. Takahashi ◽  
S. Terashima
Keyword(s):  
Magnetic Field ◽  
Super Resolution ◽  
Optical Disk ◽  
High Density ◽  
Modulation Method ◽  
Magnetic Field Modulation ◽  
High Density Recording ◽  
Field Modulation

scholarly journals MAGNETO-OPTICAL DISK STRUCTURE SUITABLE FOR MAGNETIC FIELD MODULATION METHOD

1993 ◽  
Vol 17 (S_1_MORIS_92) ◽  
pp. S1_341-346 ◽  
Author(s):  
Y. Murakami ◽  
J. Nakayama ◽  
M. Mieda ◽  
A. Takahashi ◽  
K. Ohta ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Optical Disk ◽  
Modulation Method ◽  
Magnetic Field Modulation ◽  
Disk Structure ◽  
Field Modulation

High Density Magneto-Optical Disk Capable of Overwriting by Magnetic Field Modulation

1988 ◽  
Vol 3 (8) ◽  
pp. 633-641 ◽  
Author(s):  
R. Ando ◽  
K. Fujiie ◽  
T. Yoshida ◽  
K. Watanabe ◽  
T. Nagaki
Keyword(s):  
Magnetic Field ◽  
Optical Disk ◽  
High Density ◽  
Magnetic Field Modulation ◽  
Field Modulation

Edge Shift Of Written Domain In Magnetic Field Modulation Method For Magneto-Optical Disk

1989 ◽  
Author(s):  
Hitoshi Watanabe ◽  
Takeshi Nakao ◽  
Takeshi Maeda ◽  
Atsushi Saito ◽  
Nobuyuki Nagai
Keyword(s):  
Magnetic Field ◽  
Optical Disk ◽  
Modulation Method ◽  
Magnetic Field Modulation ◽  
Field Modulation

High Density Recording on Conventionally Structured Magneto-Optical Disk by Magnetic Field Modulation

1998 ◽  
Vol 517 ◽  
Author(s):  
M. Kaneko ◽  
A. Fukumoto
Keyword(s):  
Magnetic Field ◽  
Cross Talk ◽  
Phase Shifter ◽  
Numerical Aperture ◽  
High Density ◽  
Light Wavelength ◽  
Optical Phase ◽  
Magnetic Field Modulation ◽  
High Density Recording ◽  
Field Modulation

AbstractTwo recent topics on high density recording are reviewed in this paper on conventionally structured MO disk by magnetic field modulation. One topic is the MO disk with a capacity of 650 MB/ φ 64 mm. Using a light wavelength of 650 nm and an numerical aperture of an objective lens of 0.52, a track pitch of 0.95 μm and a bit length of 0.34 μm for (1,7) RLL coding has been applied to achieve 650 MB within a size of a Mini Disc(MD). Groove conditions such as the depth and groove duty in a 1.2-mm thick polycarbonate substrate are optimized to reduce the cross-talk from adjacent tracks. As a result, the recording power margin of ± 20% is obtained. The disk tilt margin is ± 0.82 deg and ± 0.63 deg in the radial and tangential direction, respectively.The other topics is land/groove recording using an optical phase shifter. A maximum carrier level and a minimum cross-talk are achieved simultaneously when an optical phase shifter is inserted into the optical path before an analyzer. The optimum phase shift is 40 deg for recording on land and -40 deg for recording in groove. Recording on 0.5 μm land/0.5 μm groove with 1.2-mm thick substrate is investigated with a bit length of 0.35 μm for (1,7) RLL code using a light wavelength of 693 nm and a numerical aperture of 0.55. MO recording using an optical phase shifter is promising for an areal density of 3.7 Gb/in2. Furthermore, when an optical phase shifter is applied to recording on 0.36 jim land/0.36 μm groove with a bit length of 0.258 μm, light wavelength of 642 nm, and NA of 0.7, a capability of 7.0 Gb/in2 using conventionally structured MO disk is shown.

scholarly journals HIGH-DENSITY MAGNETO-OPTICAL DISK RECORDING USING MAGNETIC FIELD MODULATION WITH A CAPACITY OF 650 MB/ø64 mm

1998 ◽  
Vol 22 (S_2_MORIS_97) ◽  
pp. S2_173-176
Author(s):  
M. Shinoda ◽  
M. Kanno ◽  
S. Masuhara ◽  
M. Hattori ◽  
M. Kaneko
Keyword(s):  
Magnetic Field ◽  
Optical Disk ◽  
High Density ◽  
Magnetic Field Modulation ◽  
Field Modulation
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