ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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27.15
Displaying 1-12 of 12 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Simulation of thermomagnetic recording process for small size mark using Magnetic Field Modulation method
    Tomohiro Koyama, Takeshi Kato, Satoshi Iwata, Shigeru Tsunashima
    Article type: Article
    Session ID: MMS2003-23
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    hermomagnetic recording process has been simulated to discuss about the mark expansion and collapse which occured when very small size marks are recorded by magnetic field modulation method. Rectangular shaped marks were assumed to be witten on conventional TbFeCo media. The domains were separated by front and rear walls in the track direction and no side walls in the track width direction. Stability condition of the wall was examined by using Huth' s model. It was found that the mark expansion from stray field acting on the wall, and that the smaller stray field lead to the smaller mark expansion. However, the decrease of the stray field was found to influence the stability of marks and make it difficult to form small size marks. The enhancement of the coercive field is necessary for TbFeCo media to record marks smaller than-100nm.
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  • Phase Change Recording Media of 20GB Capacity (AOD) For System with 0.6mm-thick Substrate : Media Technology for Obtaining Larger Data Density
    Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Katsutaro Ichihara, ...
    Article type: Article
    Session ID: MMS2003-24
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We have developed phase change media of 20GB user data capacity for the next generation optical recording system using a blue-violet laser diode with the wavelength of 405 nm. An objective lens with the numerical aperture of 0.65 has been used along with 0.6 mm-thick substrates on which the laser is incident. We have employed the land and groove recording. A transparent film with high thermal conductivity has been adopted at the light incident side of the recording layer in order to improve the carrier to noise ratio and the erase ratio as well as to reduce the cross-erase. Bottom channel bit error rate of less than 1x10 6 has been obtained and its wide tilt margins have successfully demonstrated the strong feasibility for the next generation rewritable system.transparent thermal control layer
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  • High-Data-Rate Writing on Optical Disk without Write-strategy using Multipulse
    Masahiko KISHIDA, Kiyohiko ISHIKAWA, Haruki TOKUMARU, Yoshihiro FUJITA ...
    Article type: Article
    Session ID: MMS2003-25
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Videocassette recorders (VCRs) are currently being used in broadcasting corporations. However, there is a growing desire to replace these VCRs with optical disk systems that provide faster access. Optical disk systems are also more suitable for archiving. Broadcasting optical disk system would require not only high capacity but also high-transfer-rate. Previously we reported on a read/write experiment without write-strategy using multipulse at a data-rate of 100 Mb/s by using a red laser optical disk system. We study the possibility of a 200 Mb/s transfer-rate by using a blue-violet laser optical disk system without write-strategy using multipulse.
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  • 50GB Dual Layer ROM Disc by EB recording
    Masahiko TSUKUDA, Eiichi ITO, Yuko KAWAGUCHI, Morio TOMIYAMA, Shinya A ...
    Article type: Article
    Session ID: MMS2003-26
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We developed a 50 GB dual layer read only memory (ROM) disc made by electron beam recording. The practical recording velocity was realized by control of the recording pulse and the adjustment of the post exposure bake (PEB) condition for the chemically amplified resist. The recording condition was optimized for each layer. A replication process of dual layer ROM disc for production was developed. A sufficient jitter value was obtained for each layer from fabricated disc.
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  • Deep-UV Near Field Exposure for Optical Disk Mastering
    Shingo Imanishi
    Article type: Article
    Session ID: MMS2003-27
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Near-field mastering process was realized with a 266 nm laser and a solid immersion lens (SIL) of 1.35 numerical aperture (NA). For an objective, one of molded aspherical lenses with a wave front error (WFE) of below 70 mλrms was assembled with a supersphere SIL of about 25 mλrms WFE. The distance between the SIL and the glassmaster, or the air gap, was detected with using a 532 nm laser and it was servo-controlled at about 100 nm by driving the objective with an air-suspended pad and a PZT actuator. A residual fluctuation of the air gap was constrained within 10 nmPP. As a result of read only memory (ROM) recording in a density corresponding to 40 gigabytes (GB) in compact disc (CD) size, a clear pit pattern was fabricated. As for 25 GB ROM recording, acceptable signal quality was obtained.
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  • High Accuracy Mastering Using an Electron Beam Recorder
    Y. Kojima, T. Sugimoto, O. Kasono, M. Katsumura, T. Iida
    Article type: Article
    Session ID: MMS2003-28
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A next generation optical disk is required to have over 23 GB recording capacity for over 2 hour storage of digital high-definition television data. Because a track pitch becomes narrower for such a large capacity disk, high resolution and high accuracy mastering system is required. To realize this objective, we have developed an electron beam recorder (EBR) and have been studying to fabricate master stampers for the next generation optical disk and for future optical disks. In this paper, we report an investigation of recording positional accuracy in the EBR and a trial for improvement.
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  • Fabrication of Patterned Media using Self-organizing Block copolymers and Nanoimprint Lithography
    Hiroyuki HIEDA, Msatoshi SAKURAI, Yoshiyuki KAMATA, Akira KIKITSU, Koh ...
    Article type: Article
    Session ID: MMS2003-29
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Magnetic patterned media which had magnetic dots aligned circumferentially on whole region of 2.5 inch glass disk substrates were fabricated. Block copolymer templates were used as etching masks for ion milling of magnetic films. Grooves on resist films which were patterned by nanoimprinting technique aligned the orientation of self-organized patterns of phase-separated block copolymers. Arrays of CoPt and CoCrPt dots with 40 nnvdiameter, 50 nm-height and 80 nm-pitch aligned circumferential tracks were obtained by this method. The dots were revealed to have perpendicular magnetic anisotropy with single magnetic domain.
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  • Fine grains and Magnetic Properties of Sr-M Ferrite Thin Films with Large Perpendicular Magnetic Anisotropy
    Keisuke MIZUNO, Keisuke MATSUNO, Shigeki NAKAGAWA
    Article type: Article
    Session ID: MMS2003-30
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_43
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The flash annealing process, which is to deposit thin films at low temperature of 250t and to anneal them at high temperature of 900*0 in the air for a few minutes, was so effective for magneto-plumbite type (M-type) ferrite thin films deposited on Pt underlayer to crystallize them with well c-axis orientation even at the thickness of them below 20 nm. They exhibited also finer grains and smooth surfaces after the process. The flash annealing process were applied to LaCo substituted Sr ferrite (LaCo-SrM), which has a large magneto-crystalline anisotropy. The LaCo-SrM/Pt films exhibited high perpendicular coercivity above 4kOe, and their in-plane grain size was reduced to about 20 nm. Their magnetic properties were improved by constructing multilayer configuration using Pt interlayers into a LaCo-SrM layer. LaCo-SrM/Pt multilayers exhibited higher perpendicular coecivity above 5kOe and large squareness ratio around 0.9. The LaCo-SrM/Pt multilayer seems to be applicable for perpendicular magnetic recording media.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: February 28, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.15.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
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