High-Speed and Precise Gap Servo System for Near-Field Optical Recording

Koide, Daiichi; Kajiyama, Tisato; Tokumaru, Haruki; Takano, Yoshimichi; Nabata, Yuta; Ogata, Tokoku; Miyazaki, Toshimasa; Ohishi, Kiyoshi

doi:10.1143/jjap.51.08ja04

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…The evolution of the optical disc has experienced three generations ranging from compact disc (CD) to Blu-ray disc. The major hurdle to prevent optical disc from booming its capacity results from the fact that the diameter of the laser spot focused on the optical disc is approximately proportional to the wavelength of the laser beam and inversely proportional to the numerical aperture (NA) of the objective lens [ 4 , 5 ]. In this case, the storage capacity of the optical disc can seemingly be enhanced by either reducing the beam wavelength or increasing the NA.…”

Section: Reviewmentioning

confidence: 99%

Overview of Probe-based Storage Technologies

et al. 2016

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The current world is in the age of big data where the total amount of global digital data is growing up at an incredible rate. This indeed necessitates a drastic enhancement on the capacity of conventional data storage devices that are, however, suffering from their respective physical drawbacks. Under this circumstance, it is essential to aggressively explore and develop alternative promising mass storage devices, leading to the presence of probe-based storage devices. In this paper, the physical principles and the current status of several different probe storage devices, including thermo-mechanical probe memory, magnetic probe memory, ferroelectric probe memory, and phase-change probe memory, are reviewed in details, as well as their respective merits and weakness. This paper provides an overview of the emerging probe memories potentially for next generation storage device so as to motivate the exploration of more innovative technologies to push forward the development of the probe storage devices.

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Section: Reviewmentioning

confidence: 99%

Overview of Probe-based Storage Technologies

et al. 2016

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“…The gap servo system was used to reduce harmonics for axial run-out disturbance-feedforward control (RHD-FFC). 35)…”

Section: High-density Flexible Optical Diskmentioning

confidence: 99%

Near-Field Optical Recording Using Solid Immersion Lens for High-Density Flexible Optical Disks

Koide

Kajiyama

Sato

et al. 2013

Jpn. J. Appl. Phys.

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We propose a near-field optical recording flexible optical disk (NFR-FOD) for high-density recording at a high data transfer rate. We built a prototype high-density NFR-FOD that had a track pitch of 0.16 µm and we stacked some recording layers on a thin substrate that was 0.1 mm thick. We rotated the NFR-FOD closing the mechanical stabilizer on a drive system with less than 10 µmp–p axial run-out and achieved precise gap servo operation at a high rotational speed. We demonstrated near-field optical recording with a solid immersion lens with a numerical aperture (NA) of 1.84 on the NFR-FOD. The NFR-FOD has a fourfold higher recording density than the current Blu-ray disc, corresponding to a capacity of 100 Gbytes per layer, and a high data transfer rate of 250 Mbps, while rotating at half the speed.

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“…1 This incomprehensive growth has vigorously triggered the development of storage areal density toward 10 Tbit/in 2 that is required to meet the storage demand for such everincreasing global data. 2 Hard disk drive (HDD), 3,4 optical disc drive (ODD), 5,6 and Flash memory 7,8 are currently three primary memory devices for mass storage applications. These three devices are however facing stringent challenge to continue to increase storage capacity while lowering the cost per bit so as to satisfy the growing information demands in zettabytes that are estimated to be increasing at !…”

Section: Introductionmentioning

confidence: 99%

The Route for Ultra-High Recording Density Using Probe-Based Data Storage Device

Wang

Wen

Yang

et al. 2015

NANO

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Phase-change probe memory using Ge 2 Sb 2 Te 5 has been considered as one of the promising candidates as next-generation data storage device due to its ultra-high density, low energy consumption, short access time and long retention time. In order to utmostly mimic the practical setup, and thus fully explore the potential of phase-change probe memory for 10 Tbit/in 2 target, some advanced modeling techniques that include threshold-switching, electrical contact resistance, thermal boundary resistance and crystal nucleation-growth, are introduced into the already-established electrothermal model to simulate the write and read performance of phasechange probe memory using an optimal media stack design. The resulting predictions clearly demonstrate the capability of phase-change probe memory to record 10 Tbit/in 2 density under pico Joule energy within micro second period.

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High-Speed and Precise Gap Servo System for Near-Field Optical Recording

Cited by 3 publications

References 22 publications

Overview of Probe-based Storage Technologies

Overview of Probe-based Storage Technologies

Near-Field Optical Recording Using Solid Immersion Lens for High-Density Flexible Optical Disks

The Route for Ultra-High Recording Density Using Probe-Based Data Storage Device

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