ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
27.2
Displaying 1-9 of 9 articles from this issue
  • Article type: Cover
    Pages Cover1-
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Article type: Index
    Pages Toc1-
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Masakiyo TSUNODA, Migaku TAKAHASHI
    Article type: Article
    Session ID: MMS2003-6
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The ultra-clean sputtering process (UC-process), which has been developed by the present authors, is an indispensable infrastructure for the precise control of the microstructure of metallic thin films. Developing new thin film fabrication techniques under the UC-process, the authors succeeded to control the grain size of the magnetic thin films for ultra-high-density magnetic storage devices. In the present paper, we demonstrate the enlarged in-plane grain diameter in Co/Cu mutilayers and the sharpened grain size distribution in magnetic recording media, by using novel buffer layers and ultra-thin seed layers, respectively. The guiding principles for the material design of such buffer and seed layers are also presented.
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  • Das Sarbanoo, Shigeki Nakagawa
    Article type: Article
    Session ID: MMS2003-7
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Ferromagnetic Hall effects have been used to evaluate the magnetization process and the magnetic interparticle interaction in the recording layer of double-layered perpendicular magnetic recording media having a soft magnetic layer under the recording layer. Recording layer and the soft magnetic underlayer, which possess different magnetic anisotropy, reveal different symmetries in the Hall voltage characteristics with respect to the applied magnetic field. This difference has been applied to detect the magnetization process in these layers. Moreover, initial magnetization curves for the recording layer have been extracted to evaluate the magnetic interaction among particles in the recording layer of a double-layered media under the application of canted magnetic field.
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  • Sadayuki WATANABE, Shunji TAKENOIRI, Yasushi SAKAI, Kazuo ENOMOTO, Hir ...
    Article type: Article
    Session ID: MMS2003-8
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    SiO_2 added CoPtCr magnetic layer is employed for the perpendicular recording media. The microstructure, magnetic properties, and recording performance of these media are discussed. Very fine grain of the size of less than 7 nm, surrounded by grain boundaries which mainly consisted of silicon oxide, are realized. The addition of SiO_2 to CoPtCr is very effective to enhance well isolated fine grain structure without disturbing the epitaxial growth of the CoPtCr grains on Ru underlayer. The media show a large perpendicular anisotropy K_u of 〜3.5 × 10^6 erg/cm^3 and a K_uV/kT value more than 80, even at the CoPtCr-SiO_2 thickness of 12 nm, resulting in a high coercivity Hc (〜4 kOe) and high squareness M_r/M_S of 0.9. The CoPtCr-SiO_2 medium shows excellent SNR performance together with high thermal stability at very thin thickness, indicating a great potential for high-density perpendicular recording media.
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  • Junya MATSUGI, Taro NAKANO, Yoshiaki MIZOH
    Article type: Article
    Session ID: MMS2003-9
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    It is well known that the magnetic recording head for HDD (Hard Disk Drive), GMR head for example, is highly sensitive to ESD (Electrostatic discharge). However the categorization of the ESD damage modes in GMR heads has not been discussed in depth so far. This paper gives one suggestion where detailed classification of ESD failure in GMR head is described. This will allow much clearer understanding of ESD damage picture of GMR heads. The paper also reports the actual samples of ESD damages happened at the process of GMR heads or HDD.
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  • Susumu Takagi
    Article type: Article
    Session ID: MMS2003-10
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    With the demand of the HDD having larger capacities, the physical spacing between the magnetic recording head and magnetic recording disk needs to be decreased. This requires that the surface roughness of the magnetic recording disk must be decreased. Increased stiction due to disk flatness will cause the failure of HDI. The magnetic recording head with DLC pad, which makes less stiction and friction, was studied for developing reliable HDI. Stiction and friction during CSS were measured for the optimization purpose. The results show that the magnetic recording head, which has optimized ABS and optimized DLC pads, performed good anti-stiction capability and enough CSS reliability at 15nm FH on the LZT media having low height bump.
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  • Article type: Appendix
    Pages App1-
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Article type: Appendix
    Pages App2-
    Published: January 17, 2003
    Released on J-STAGE: September 20, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
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