15-Gbit/in<sup>2</sup>recording on a DWDD disc using a land/groove substrate with a red laser enabled by a side-wall annealing process

Miki, Tsuneharu; Kai, Shinichi; Takeshita, Yasuyuki; Fujita, Goro; Fujiie, Kazuhiko; Koyama, Osamu; Miyaoka, Yasuyuki; Hiroki, Tomoyuki; Hozumi, Yasushi; Kikuchi, Masaru; Shiratori, Tsutomu

doi:10.1117/12.532516

Cited by 2 publications

(1 citation statement)

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“…Domain wall displacement detection (DWDD) 1) is an excellent method for achieving high recording density on magneto-optical (MO) disks. Over the past few years, a considerable number of studies have been carried out on DWDD disks using a red laser diode (LD) [2][3][4] and a blue LD. 5,6) Tanaka et al reported two types of DWDD disks, an anneal-less type and a sidewall-annealed type, which enabled a land/groove recording of 15 Gbit/in 2 using a wavelength of 660 nm and a numerical aperture (NA) of 0.6.…”

Section: Introductionmentioning

confidence: 99%

Anneal-Less Domain Wall Displacement Detection of 27 Gbit/in² Land/Groove Recording Using a Deep Groove Substrate and a Blue Laser

Hiroki

Deguchi

Morita

et al. 2005

Jpn. J. Appl. Phys.

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We have studied an anneal-less domain wall displacement detection (DWDD) disk of a land/groove recording on a deep groove substrate using a numerical aperture (NA) 0.65 objective lens and a blue laser diode (LD). The substrates were prepared using a stamper formed by reactive ion etching (RIE) and O2 plasma treatment to realize both steep side-wall angles and smooth surfaces on the substrates. In designing the groove shape, we have clarified three key factors: the groove edge shape, the groove depth and the land width. These factors affected the magnetic film discontinuity at the groove edge and the recording power margin on the land. We have achieved a recording density of 27 Gbit/in2 by optimizing the groove shape.

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Section: Introductionmentioning

confidence: 99%

Anneal-Less Domain Wall Displacement Detection of 27 Gbit/in² Land/Groove Recording Using a Deep Groove Substrate and a Blue Laser

Hiroki

Deguchi

Morita

et al. 2005

Jpn. J. Appl. Phys.

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Bit Length of 57 nm Recording on Domain Wall Displacement Detection Disk Using Turbo Codes with Blue Laser

Uno

Yamamoto

Hozumi

2006

jjap

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Turbo codes with max log maximum a posteriori probability (max-log-MAP) algorithm were experimentally applied to a domain wall displacement detection (DWDD) disk using a blue laser. The max-log-MAP algorithm is an approximation of the maximum a posteriori probability (MAP) algorithm; however, it reduces the amount of calculation and consumption of memory. An effective bit length of 56.5 nm recording was achieved using a partial turbo method with a parity bit rate of 1/17 at a bit error rate (bER) of 4 ×10-5 using a blue laser, although a bit length of 68.5 nm was the limit using a red laser. According to an analysis of the number of errors, the bER of the turbo method was found to depend on the number of consecutive 2-bit errors that occur with the dropout of the 2T pattern, and a jitter value less than 16% was necessary to keep the bER below 4 ×10-5 for the turbo method.

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15-Gbit/in²recording on a DWDD disc using a land/groove substrate with a red laser enabled by a side-wall annealing process

Cited by 2 publications

References 4 publications

Anneal-Less Domain Wall Displacement Detection of 27 Gbit/in² Land/Groove Recording Using a Deep Groove Substrate and a Blue Laser

Anneal-Less Domain Wall Displacement Detection of 27 Gbit/in² Land/Groove Recording Using a Deep Groove Substrate and a Blue Laser

Bit Length of 57 nm Recording on Domain Wall Displacement Detection Disk Using Turbo Codes with Blue Laser

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15-Gbit/in2recording on a DWDD disc using a land/groove substrate with a red laser enabled by a side-wall annealing process

Cited by 2 publications

References 4 publications

Anneal-Less Domain Wall Displacement Detection of 27 Gbit/in2 Land/Groove Recording Using a Deep Groove Substrate and a Blue Laser

Anneal-Less Domain Wall Displacement Detection of 27 Gbit/in2 Land/Groove Recording Using a Deep Groove Substrate and a Blue Laser

Bit Length of 57 nm Recording on Domain Wall Displacement Detection Disk Using Turbo Codes with Blue Laser

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15-Gbit/in²recording on a DWDD disc using a land/groove substrate with a red laser enabled by a side-wall annealing process

Anneal-Less Domain Wall Displacement Detection of 27 Gbit/in² Land/Groove Recording Using a Deep Groove Substrate and a Blue Laser

Anneal-Less Domain Wall Displacement Detection of 27 Gbit/in² Land/Groove Recording Using a Deep Groove Substrate and a Blue Laser