High-Density Magneto-Optical Recording with Domain Wall Displacement Detection

Shiratori, Tsutomu; Fujii, Eiichi; Miyaoka, Yasuyuki; Hozumi, Yasushi

doi:10.1541/ieejfms1990.119.4_419

Cited by 4 publications

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“…Magneto-optical recording can improve the recording density greatly by combining magnetically induced super-resolution (MSR) detection process and high numerical aperture optical system with blue laser [1][2][3][4] . Because of the shortening of laser wavelength and the augment of numerical aperture, the recording spot would be minished, which results in enhancing of the laser beam's power density and increases the temperature of the irradiated region of the thin film.…”

Section: Introductionmentioning

confidence: 99%

Apparatus for statically testing the properties of magnetic coupling and hybrid recording thin films

et al. 2005

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We designed and built up an apparatus for measuring the properties of magnetic coupling thin films and hybrid recording media. The temperature of the tested points of the thin film samples change as irradiated by focused laser beam through adjusting laser power. By calculation, we also simulated the distribution of temperature in TbFeCo magneto-optical films irradiated by laser, in order to get the relationship between the film coercive force and the irradiating laser power. Using this apparatus, we can determine the Curie temperature and compensation temperature of the films. The apparatus might present an effective approach for studying the variation of magneto-optical characteristics of films at different temperatures and the properties of magnetic coupling multilayer films, and it could be useful for studying hybrid recording.

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Section: Introductionmentioning

confidence: 99%

Apparatus for statically testing the properties of magnetic coupling and hybrid recording thin films

et al. 2005

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“…On magneto-optical media, signals recorded at a density beyond the optical resolution limit can be repoduced by a super-resolution technology such as Domain Wall Displacement Detection (DWDD) 1 . However, in order to perform such high-density recording, it has so far been necessary to place a magnetic field modulation head close to the recording film.…”

Section: Introductionmentioning

confidence: 99%

Non-bias magneto-optical recording

et al. 2004

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Without applying an external magnetic field, high-density recording beyond the optical resolution limit was realized with light intensity modulation, using Domain Tail Erasing (DTE) and Domain Wall Displacement Detection (DWDD). In order to obtain a sufficiently strong bias field to perform recording with a bias layer introduced into the DTE medium, the stray field distribution during the recording process was studied by simulation. A stray field most effectively worked on the recording layer when the Curie temperature of the bias layer was designed at a certain level below the recording temperature. Furthermore, by replacing a part of the bias layer with a bias assist layer, which had a higher Curie temperature and lower coercive force, an even stronger stray field was generated. According to the simulation, non-bias DTE medium was designed, and as a result a sufficiently low jitter value and dropout rate were obtained without bias magnets at a bit length of 80 nm and a track pitch of 0.74 m, using the same optical parameters of a current DVD.

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“…The DWDD technique, which was previously proposed by Shiratori et al [1], has an exceptional ability for high resolution linear recording in optical storage. Since the invention, many related studies have been reported.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2003

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We developed a side-wall-annealing technique for land/groove substrates. By applying this technique to our Domain Wall Displacement Detection (DWDD) Magneto-Optical (MO) recording stack formed on a landlgroove substrate, even with an NA of 0.6 and a wavelength of 660 nm, we realized a density of 15 Gbit/in2 with a sufficiently wide recording tolerance. This density corresponds to a capacity of4.7 GB on a 64 mm disc like MiniDisc.

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High-Density Magneto-Optical Recording with Domain Wall Displacement Detection

Cited by 4 publications

References 4 publications

Apparatus for statically testing the properties of magnetic coupling and hybrid recording thin films

Apparatus for statically testing the properties of magnetic coupling and hybrid recording thin films

Non-bias magneto-optical recording

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

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High-Density Magneto-Optical Recording with Domain Wall Displacement Detection

Cited by 4 publications

References 4 publications

Apparatus for statically testing the properties of magnetic coupling and hybrid recording thin films

Apparatus for statically testing the properties of magnetic coupling and hybrid recording thin films

Non-bias magneto-optical recording

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

Contact Info

Product

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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