ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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24.22
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Coercivity Enhancement by Roughening a Substrate Surface
    Masahiro Birukawa, Norio Miyatake, Takao Suzuki
    Article type: Article
    Session ID: VIR2000-30
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The present study describes a wall pinning coercivity enhancement due to roughening a substrate surface by plasma etching using CF_4 gas. Although a roughness amplitude R_a is only 0.62 nm, the coercivity enhancement more than 2 kOe is achieved by adjusting a plasma etching condition, because roughness wavelength is comparable to domain wall width. These results are expected for a prevention technique of domain shrinkage due to thermal energy in high-density magneto-optical recording.
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  • SOLID IMMERSION LENS AND MAGNETIC FIELD MODULATION FOR HIGH DENSITY MO RECORDING
    R. Sbiaa, E. Stavrou, A. Chekanov, M. Birukawa, Y. Itoh, T. Suzuki
    Article type: Article
    Session ID: VIR2000-31
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A near field optical technique based on combined supersphere solid immersion lens (SIL) with magnetic field modulation (MFM) recording is described for high density magneto-optical recording. The analysis of read-write performance of this system has been developed in this paper. A better resolution has been achieved by using SIL with MFM recording in comparison with light intensity modulation (LIM). We found that recorded mark of 0.3 μm × 0.2 μm could be obtained. These marks were readout by the SIL head with a typical signal to noise ratio value of 36 dB. The present study demonstrated the capability to achieve a very high areal density beyond 20 Gb/in^2
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  • MAGNETIC VISCOSITY AND STABILITY OF MAGNETOOPTICAL RECORDING MEDIA
    Rachid Sbiaa, Mitsunori Mochida, Yusuke Itoh, Takao Suzuki
    Article type: Article
    Session ID: VIR2000-32
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_11
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this study, the time dependence of the magnetization process in amorphous TbFeCo thin films and (TbFeCo/Pt) multilayers is studied. By assuming a Gaussien distribution of relaxation times for magnetic aftereffect, we were able to describe the non-Arrhenius behavior of the magnetization decay shown in almost all of our samples. From a fitting of experimental data one can determine the mean value of relaxation time τ_0 and also its width Δτ_0. The multilayers of TbFeCo/Pt show a high stability compared to monolayers of TbFeCo with also a small activation volume. Key words: magneto-optical recording, solid immersion lens(SIL), numerical aperture(NA), near field optics.
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  • ROM type optical disk using multilevel recording
    Takeshi Maeda, Koichiro Wakabayashi, Keizo Kato, Hirofumi Sukeda
    Article type: Article
    Session ID: VIR2000-33
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_15
    CONFERENCE PROCEEDINGS FREE ACCESS
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    This method is to use the multilevel recording in order to increase the storage capacity under the limited spot size. In this method, the multilevel recording is utilized by varying the diameter of circular marks, which are arranged like a two-dimensional lattice. When reading out the signal, multi-spot scan the marks on each track and the signal is obtained by canceling the inter-symbol interference and the cross-talk using the each detecting signals from each track. In this paper, the following items are reported. (1)The idea and concept of this method are proposed. (2)Marks that have different diameter are formed by a laser cutter. (3)The average and deviation of formed marks are measured.
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  • Consideration of jitter on Mark-edge recording
    Hiroyuki Minemura, Hiroyuki Tsuchinaga, Takeshi Maeda
    Article type: Article
    Session ID: VIR2000-34
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
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    All most optical disk are adopted a mark-edge recording for increasing a data capacity. Interchangeability between drives and media is important because an optical disk is changeable media. This paper focuses on a jitter characteristic, which is important to estimate the interchangeability. The deviation factors of a jitter are analyzed, an analysis equation of a jitter is deduced regarding to a probability of generating a mark and space. In addition, the way how to measure the remained edge-shift in these factors is reported.
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  • Transition of magnetization direction in readout layers of magneto-static CAD-MSR
    J. Hirokane
    Article type: Article
    Session ID: VIR2000-35
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_27
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Transition of magnetization direction from in-plane to perpendicular has been investigated for a GdFeCo readout layer of Center Aperture Detection(CAD). A transition for a GdFeCo readout layer is calculated as the layer has a stripe magnetic domain structure. The calculation showed that the transition occurs more repidly as the thickness of the readout layer becomes thinner. Another transition for a GdFeCo readout layer, which is exchange-coupled with a GdFe mask layer having in-plane magnetization, is calculated using the noncontinuous model. The calculation showed also that the thinner readout layer makes the transition more repidly.
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  • High density optical recording using MAMMOS readout
    Naoyuki Takagi, Kenichiro Mitani, Hitoshi Noguchi, Atsushi Yamaguchi, ...
    Article type: Article
    Session ID: VIR2000-36
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
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    MAMMOS(Magnetic Amplifying Magneto-Optical System) is one of the technologies that can overcome the diffraction limit. Since, it can achieve both high resolution and large signal simultaneously, it is available for next generation MO systems. We discovered that it is very effective for readout of small magnetic domains to apply an in-plane magnetic field. Under conditions where λ=635 nm and NA=0.55, the bit error rate(BER) of 0.15 μm packed domain was 2 ×10^<-4>.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: March 07, 2000
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.24.22.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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