ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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22.29
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Preparation of Ordered Fe-Pt Thin Films with Large Magnetocrystalline Anisotropy for Perpendicular Magnetic Recording Media
    Toshio SUZUKI, Naoki HONDA, Kazuhiro OUCHI
    Article type: Article
    Pages 1-6
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A new preparation method for ordered Fe-Pt thin films with perpendicular magnetic anisotropy was studied, aiming at a future high density magnetic recording medium. Low temperature ordering phenomenon was found at high Ar sputter-gas pressure with Cr(100) underlayer. Extremely large perpendicular magnetic anisotropy was obtained for a thin film using a glass substrate. Extending the method, a very fine domain pattern was successfully observed. The Fe-Pt film with fine domains seems to be a new type medium preferred for high resolution and low noise.
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  • Low-Temperature and High-Speed Fabrication of Co-γFe_2O_3/NiO Thin Film Media Using Penning Ionization
    T. Santoki, S. Yamamoto, H. Kurisu, M. Matsuura, K. Nakata, Y. Kakihar ...
    Article type: Article
    Pages 7-14
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In the conventional fabrication of a Co-γ Fe_2O_3/NiO thin film media, at first, a CoO-Fe_2O_4 thin film is sputter-deposited onto a NiO underlayer, and the film is kept in the air for 0.5-2 hours at a temperature of about 300℃ for oxidization. Oxidization mehtod using Oxygen ions in plasma was investigated in this study. Remarkably effective oxidization was achieved by utilizing Oxygen ions in an electron-cyclotron-resonance microwave plasma, promotion of oxygen ion generation by Penning ionization using metastable He atoms, and neutralization for preventing static electricity of samples. The plasma oxidization method shortens the processing time to 10 seconds and lowers the process temperature to 150℃.
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  • Thickness Dependence of Noise Characteristics in CoCr-alloy Single-layer Perpendicular Recording Media
    Y. Hirayama, Y. Honda, K. Ito, M. Futamoto
    Article type: Article
    Pages 15-22
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_15
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Thickness dependence of noise characteristics have been investigated for CoCr_<19>Pt_<10> and CoCr_<17>Ta_4 single-layer perpendicular media. The maximum S/N ratios are observed for both-type media when the recording layer thickness is around 25 nm. Good correlation between the magnetic domain size observed by MFM and the noise value measured by MR head shows that it is necessary to decrease the magnetic domain size to reduce the medium noise. A fairly large magnetization fluctuations are observed in the MFM image of CoCrPt perpendicular media with high Mr/Ms ratio, which are expected to show low noise property because of the small volume fraction of reversed domains. This result indicates that the high Mr/Ms is not always a satisfactory condition to get a low noise perpendicular medium. Further study focusing on the magnetization structure is still necessary to improve the noise characteristics.
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  • High-Density Recording Performance of Co-Cr-Nb alloy Perpendicular Magnetic Recording Medium
    Satoshi YANASE, Jun ARIAKE, Naoki HONDA, kazuhiro OUCHI
    Article type: Article
    Pages 23-30
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The recording performance of Co-Cr-Nb perpendicular media was evaluated using a merged MR head and a small gap length MIG head. Decrease in output at large current for single layer medium was reduced and over write property was improved by using a small gap length MIG head. Larger flying height suppressed the output decrease at the expense of the peak output voltage. This may be related to broadening of perpendicular head field. It was suggested that high-density recording for perpendicular medium is possible using a ring head with a small gap length and a low flying height. A high areal recording density of 17 Gbit/in^2 would be expected from the recording performance and the MFM image for combination of a ring head and the single layer perpendicular medium.
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  • Influence of external field on single-pole head and perpendicular double-layered media
    W.H. Jiang, H. Muraoka, H. Yamada, Y. Sugita, Y. Nakamura
    Article type: Article
    Pages 31-35
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_31
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In perpendicular magnetic recording utilizing double layer media, demagnetization of recorded bit by a single pole head, which is called "head induced erasure", is one of the issues. This is caused by the strong head-to-medium magnetic interaction between the main pole of the single pole head and the underlayer of the double layered perpendicular medium. In this report, this head induced erasure by stray field was measured for various heads and media combination. Permeability of the underlayer and the structure of the head improved the demagnetization. A computer simulation based on the Finite Element Method was carried out, and supported these tendencies obtained by the experiments.
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  • ISSUES AND PROSPECTS FOR FUTURE HIGH-DENSITY MAGNETIC STORAGE
    Yoshihisa NAKAMURA
    Article type: Article
    Pages 37-44
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Magnetic storage technology will be attained to an areal density of 100 Gbpsi in around 2010. To realize such an extremely high density magnetic storage technology, schemes for that are being searched. As one of the candidates, perpendicularly magnetizing method is reassessed. In this paper, the problems which should be solved for practical use of perpendicular magnetic storage and several solutions for them are described. Furthermore, a concept for the future ultra high density magnetic storage will be proposed.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: June 11, 1998
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.22.29.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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