The revolution in information technology has led the scientists to look for advanced materials to cater for the growing capacity of datastorage. Over the recent years, significant advances have been made in the devel...
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The revolution in information technology has led the scientists to look for advanced materials to cater for the growing capacity of datastorage. Over the recent years, significant advances have been made in the development of materials, which possess smart and intelligent functions of the magnetic datastorage and handling. These magnetic materials exhibit ferroelectric, ferrielectric and anti-ferroelectric properties. There have been successful attempts to prepare semiconducting conjugated polymers as potential materials, which has potential of being used as a base material. The magnetic properties of polyaniline are achieved by suitably doping the base material. We have developed a unique and novel method for preparation of polyaniline magnetic thin films by vapor deposition of magnetic polyaniline powder on various substrates. The characterization of thin films by optical absorption, SEM, X-ray are reported here. These studies suggest that vacuum deposited magnetic polyaniline thin films are suitable for magnetic datastorage device fabrication. (C) 2002 Elsevier Science B.V. All rights reserved.
The development of a production Electron Beam Recorder designed for making masters for optical discs of up to 100 gigabytes capacity is discussed. A second-generation electron beam column for this machine will also be...
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ISBN:
(纸本)0819437336
The development of a production Electron Beam Recorder designed for making masters for optical discs of up to 100 gigabytes capacity is discussed. A second-generation electron beam column for this machine will also be discussed and some recent results of optical discs ranging in capacity from 4.7 GB to 100 GB will be presented.
To compete in the archive and backup industries, holographic datastorage must be highly competitive in four critical areas: total cost of ownership (TCO), cost/TB, capacity/footprint, and transfer rate. New holograph...
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ISBN:
(纸本)9781628412284
To compete in the archive and backup industries, holographic datastorage must be highly competitive in four critical areas: total cost of ownership (TCO), cost/TB, capacity/footprint, and transfer rate. New holographic technology advancements by Akonia Holographics have enabled the potential for ultra-high capacity holographic storage devices that are capable of world record bit densities of over 2-4Tbit/in(2), up to 200MB/s transfer rates, and media costs less than $10/TB in the next few years. Additional advantages include more than a 3x lower TCO than LTO, a 3.5x decrease in volumetric footprint, 30ms random access times, and 50 year archive life. At these bit densities, 4.5 Petabytes of uncompressed user data could be stored in a 19" rack system. A demonstration platform based on these new advances has been designed and built by Akonia to progressively demonstrate bit densities of 2Tb/in(2), 4Tb/in(2), and 8Tb/in(2) over the next year.
Traditional von Neumann computing architecture with separated computation and storage units has already impeded the data processing performance and energy efficiency, calling for emerging neuromorphic electronic and o...
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Traditional von Neumann computing architecture with separated computation and storage units has already impeded the data processing performance and energy efficiency, calling for emerging neuromorphic electronic and optical devices and systems which can mimic the human brain to shift this paradigm. Material-level innovation has become the key component to this revolution of information technology. Chalcogenide phase-change material (PCM) as a well-acknowledged data-storage medium is a promising candidate to tackle this challenge. In this review, the use of PCMs to implement artificial neurons and synapses from both the electronic and optical respects is discussed, and in particular, the structure-property physics and transition dynamics that enable such brain-inspired and in-memory computing applications are emphasized. Recent advances on the atomic-level amorphous and crystalline structures, transition mechanisms, materials optimization and design, neural and synaptic devices, brain-inspired chips, and computing systems, as well as the future opportunities of PCMs, are summarized and discussed.
Holographic datastorage is a new opticaltechnology which allows storing an important number of bits in a recording material. In this work, two different types of modulations, defocused binary intensity modulation an...
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ISBN:
(纸本)9780819486646
Holographic datastorage is a new opticaltechnology which allows storing an important number of bits in a recording material. In this work, two different types of modulations, defocused binary intensity modulation and phase modulation, are compared to obtain which modulation could be the most suitable for holographic datastorage. The best modulation would be the modulation with a homogeneous distribution of energy in the FT plane with no zero frequency peak.
Phase-change storage is widely used in optical information technologies (DVD, CD-ROM and so on), and recently it has also been considered for non-volatile memory applications. This work reports advances in thermal dat...
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Phase-change storage is widely used in optical information technologies (DVD, CD-ROM and so on), and recently it has also been considered for non-volatile memory applications. This work reports advances in thermal data recording of phase-change materials. Specifically, we show erasable thermal phase-change recording at a storage density of 3.3 Tb inch(-2), which is three orders of magnitude denser than that currently achievable with commercial opticalstorage technologies. We demonstrate the concept of a thin film nanoheater to realize ultra-small heat spots with dimensions of less than 50 nm. Finally, we show in a proof-of-concept demonstration that an individual thin-film heater can write, erase and read the phase of these storage materials at competitive speeds. This work provides important stepping stones for a very-high-density storage or memory technology based on phase-change materials.
IDE interface and SCSI interface are the most widely used in the storage device. SCSI bus supports I/O queue but storage device with SCSI interface is some expensive, while IDE bus does not support queue by itself but...
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IDE interface and SCSI interface are the most widely used in the storage device. SCSI bus supports I/O queue but storage device with SCSI interface is some expensive, while IDE bus does not support queue by itself but its price is more acceptable. In this paper, we just propose a twin-queue algorithm to benefit from the trade-off of the performance of the SCSI interface and the cheapness of the IDE storage devices. There are two priority queues, one for the host to respond client requests via SCSI bus, the other for the IDE storage devices where the requested data really locate. It is proved that the performance of the device with twin-queue algorithm is much higher than that of the normal IDE optical drive which is not equipped with our firmware using stochastic queue service model.
This paper presents techniques developed at the Information technology Laboratory of the US National Institute of Standards and technology (NIST / ITL) for enabling microscopic image analysis of opticaldatastorage m...
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ISBN:
(纸本)081943292X
This paper presents techniques developed at the Information technology Laboratory of the US National Institute of Standards and technology (NIST / ITL) for enabling microscopic image analysis of opticaldatastorage media such as optical disks. These non-destructive techniques allow investigators to easily locate on the media a pre-existing series of media defects. These techniques can be applied to any type of optical disks including CDs and DVDs. The paper describes the experimental setup and the techniques utilized to achieve localization and registration of media defects. These techniques include data acquisition, computer control, auto focus, image processing, and remote control and observation. An extension of this setup utilizing available graphical programming environments can allow investigators at different locations to share and discuss the information on media defects by use of the Internet.
A practical method of suppressing photovoltaic noise in photorefractive iron doped lithium niobate crystals (Fe: LiNbO3) is proposed, in which the surfaces of the crystal are coated with transparent electric-conductiv...
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ISBN:
(纸本)0819455989
A practical method of suppressing photovoltaic noise in photorefractive iron doped lithium niobate crystals (Fe: LiNbO3) is proposed, in which the surfaces of the crystal are coated with transparent electric-conductive material (In2O3 doped stannum. ITO) forcing the crystal to operate in a short-circuit mode. In order to assess the validity of this method, the loss of signal-to-noise ratio (LSNR) was used to evaluate the quality of images formed directly through uncoated and ITO-coated crystals respectively Several iron doped lithium niobate crystals were measured. The main experimental results showed that the scattering noise decreased obviously in the ITO-coated crystals, suggesting that the short-circuit operation suppressed photovoltaic noise effectively. Furthermore, it is found that the dynamic range (M#) of the crystals increased after they were coated with ITO. ne results of experiments on multiple hologram recordings in the uncoated and ITO-coated Fe: LiNbO3 crystal verified the improvement of M# well.
Zn ions were added into melts with 4.0mol.%, Fe ions were with 0.02mol.%, and In ions were with varying concentration of 0, 1.0, 2.0 and 3.0mol.%. A series of Zn:In:Fe:LiNbO3 Crystals were grown by Czochralski techniq...
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ISBN:
(纸本)0819455989
Zn ions were added into melts with 4.0mol.%, Fe ions were with 0.02mol.%, and In ions were with varying concentration of 0, 1.0, 2.0 and 3.0mol.%. A series of Zn:In:Fe:LiNbO3 Crystals were grown by Czochralski technique. Their absorption spectra and photo-damage resistant ability were measured. The mechanism of the shift of OH- absorption peak was investigated. Their photorefractive properties were experimentally investigated by using two-beam coupling. The results shown that, the photo-damage resistant ability of Zn(4mol.%):In(3mol.%): Fe(0.02mol.%):LiNbO3 Crystals were two orders than that of magnitude higher than that of Fe:LiNbO3 crystals, and with concentration of Zn and In ions increasing, diffraction efficiency and response time of crystals were shortened. The experiment of associative memory were also carried out with Zn(4mol.%):In(3mol.%):Fe(0.02mol.%):LiNbO3 crystals for the recording device and with Zn(4mol.%):In(2mol.%):Fe(0.02mol.%):LiNbO3 Crystals for phase conjugation.
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