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26.19
Displaying 1-15 of 15 articles from this issue
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Article type: Cover
Pages Cover1-
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (18K) -
Article type: Index
Pages Toc1-
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (48K) -
Kunio KOJIMA, Shintaro MIYANISHI, Junichi Sato, Kazuhisa TAKAYAMA, Kou ...Article type: Article
Session ID: MMS2002-20
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSNarrow track recording is the most significant requirement for a higher area density. Laser-assisted magnetic recording technology enables narrower track recording and reproducing than the track width of a magnetic head. We have demonstrated that the laser-assisted magnetic recording has the potential of narrow track formation without loss in frequency response by using a TbFeCo magnetic recording film, a blue laser diode, and a conventional GMR magnetic head.View full abstractDownload PDF (507K) -
Kenji Sugihara, Hirohito Ito, Takeshi Kato, Satoshi Iwata, Sigeru Tsun ...Article type: Article
Session ID: MMS2002-21
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMagnetic and magneto-optical properties of MBE-grown CrPt_3 films were investigated. RHEED observations and XRD patterns suggested that the CrPt_3 grew epitaxially on MgO(111) and Al_2O_3 substrates and had Cu_3Au type ordered structure. The easy axis of magnetization of CrPt_3 on MgO(111) lies in the film plane. On the other hand, CrPt_3 on fused quartz and Al_2O_3(001c), (110c) substrates exhibit large perpendicular anisotropies. The magnetic anisotropy on fused quartz was found to be due to magneto-elastic contribution. The ratio orbital moments which was estimated from r 2p-3d XMCD measurements, was found to be related to the observed perpendicular magnetic anisotropies.View full abstractDownload PDF (645K) -
Sekine MasakiArticle type: Article
Session ID: MMS2002-22
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA Magneto-Optical disk system, named iD (intelligent, image) photo disk has been developed as a next generation media for a digital still camera. It has a large recording capacity, 730MB with a 50.8mm in diameter. It employs the laser pumped magnetic field modulation method for recording and Center Aperture Detection (CAD) type Magnetic Super Resolution (MSR) for reproducing. Furthermore, next generation media is investigated by using zero-field type MAMMOS (Magnetic Amplifying Magneto-optical System) technology with a 650-nm laser diode and a 0.60 N.A. objective lens so as to keep compatibility with the first generation iD photo disk. It was shown that the linear bit length of 0.13μm was successfully reproduced with enough readout tolerances. The mostly double recording capacity up to 1.3GB in 50.8mm diameter disk was achieved.View full abstractDownload PDF (533K) -
Tetsuhiro SakamotoArticle type: Article
Session ID: MMS2002-23
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDomain Wall Displacement Detection (DWDD) achieves the highest linear density which was proposed in 1997. It is very interesting to study the DWDD for researchers not only of an optical disc but also of magnetism. In this paper, previous studies of DWDD are introduced such as modeling and simulation, improvement of a medium structure, recording and readout experiments, and estimation of huge capacity optical disc system with DWDD. Recent experimental results are also described about land/groove recording and readout on the DWDD medium using a blue laser and a 0.60-NA bjective lens.View full abstractDownload PDF (782K) -
Koichiro KISHIMA, Isao ICHIMURA, Kimihiro SAITO, Kenji YAMAMOTO, Yuji ...Article type: Article
Session ID: MMS2002-24
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe enabled near-field optical recording by developing a near-field optical head using solid immersion lens (SIL) and airgap servo system in the range of 50nm. The areal recording density of 50 Gbit/inch^2 is expected by the combination of 1.5 Numerical-Aperture (NA) optical head and GaN laser diode as a light source. In this paper, we explain our developed optical pickup and our developed near-field phase-change optical disk, and we report the latest experimental results of challenging the areal density of over 50 Gbit/inch^2.View full abstractDownload PDF (1102K) -
Masahiko Kishida, Kiyohiko Ishikawa, Haruki Tokumaru, Haruo OkudaArticle type: Article
Session ID: MMS2002-25
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe estimated the bit error rates BERs in high-transfer-rate optical disk recording using transfer functions derived from reproduced pulses. We found that the amplitude characteristics of the rising edges of pulses recorded without using any recording strategy were no different from the frequency response recorded using a recording strategy. We also found that BERs at various conditions could be easily estimated by simulation using the transfer function of reproduced pulses. We estimated BERs at lOOMbps for various recording velocities. We also estimated the maximum transfer rate for high recording velocity.View full abstractDownload PDF (548K) -
K. Ishikawa, M. Kishida, H. Tokumaru, H. OkudaArticle type: Article
Session ID: MMS2002-26
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSOptical disk systems will replace VCR systems in broadcasting stations in the future because of their advantageous random access and high endurance features. A100 Mbps read/write experiment using a laser beam for broadcasts has already been conducted, but 100Mbps is only a minimum rate. Playback at higher rates is needed for transmitting of collected materials and post production. To address this issue, we have studied ways to achieve a higher transfer rate in playback and nonlinear editing in units comprising a certain number of frames. Performance of current optical disk drive enables two times higher transfer rate in outer area, and also enables nonlinear editing in an 8-frame unit, by using constant-angular-velocity (CAV) rotation method. We conclude that using both recording the outer area and the CAV rotation method is a suitable approach for newsgathering.View full abstractDownload PDF (557K) -
Hitoshi Yanagisawa, Daiichi Koide, Haruki Tokumaru, Haruo Okuda, Kiyos ...Article type: Article
Session ID: MMS2002-27
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn order to develop a HDTV optical disk camera-recorder, a high-speed and precise focusing/tracking servo system is indispensable for higher data transfer rate and recording density. In this paper, we adopted a feedfoward tracking method employing the Zero Phase Error for focusing/tracking servo system and reduced the residual focusing/tracking error compared with feedback system. And we confirmed that the method makes it possible to obtain stable recording and reproduced signals in optical disk system.View full abstractDownload PDF (470K) -
Hajime MITANI, Hiroshi KAMABEArticle type: Article
Session ID: MMS2002-28
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn recording channel we must suppress low frequency contents of signal and the Guided Scrambling(GS) method is one of coding scheme by which we can generate signals having suppressed low frequency contents. We investigate GS methods by polynomial division and performances of them for many parameters. We also investigate GS methods which employ disparity of codes used in the PSC and EPSC methods as their code selection criteria.View full abstractDownload PDF (652K) -
Shigeki TAIRA, Taku HOSHIZAWA, Takatoshi KATO, Yukari KATAYAMA, Takush ...Article type: Article
Session ID: MMS2002-29
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe advanced optical disks may have 2 main tasks; (1) to increase the overwriting times and (2) to increase the capacity. The experimental results of the Random-Seed Scrambling method for task (1) are shown. The method makes the overwriting times increase. For task (2), a new class of 2-dimensional runlength-limited codes is proposed. Each polarity of the code satisfies predetermined runlength constraints for each of 2 directions, when the code is placed on 2-dimensional area. Shannon capacity of the code is derived. The code make the storage capacity increase. Random-Seed Scrambling method and 2-dimensional runlength-limited code are mutually independent. Therefore one of them is also to be applied to storage.View full abstractDownload PDF (1358K) -
Takatoshi KATO, Shigeki TAIRA, Yukari KATAYAMA, Takushi NISHIYA, Takes ...Article type: Article
Session ID: MMS2002-30
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA study of two-dimensional partial-response-maximum-likelihood system for advanced optical recording is described. By computer simulation, we calculate bit-error-rate performances of the system with two-dimensional run-length-limited code whose minimum run-length is 2. Signal to noise ratio of 17.8 dB is required for this system with track pitch and bit pitch of lOOnm and bit error rate of 10^<-5>.View full abstractDownload PDF (595K) -
Article type: Appendix
Pages App1-
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (74K) -
Article type: Appendix
Pages App2-
Published: March 01, 2002
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (74K)
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