ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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27.13
Displaying 1-10 of 10 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Effect of Intra-grain Exchange Coupling on M-H curve of Perpendicular Media : Thermal fluctuation characteristic improvement.
    miki HARA, masukazu IGARASHI, atsushi NAKAMURA, yoshio SUZUKI, yutaka ...
    Article type: Article
    Session ID: MMS2003-17
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The micro-magnetic simulation based on the coherent rotation model assuming that the magnetization in a crystal grain rotates uniformly, could not reproduce a actual M-H loop of the perpendicular magnetic recording medium. We studied two new simulation models of a perpendicular magnetic recording medium to reproduce the actual M-H loop. One model, considering existence of layer of small anisotropy energy as an initial growth layer, caused insufficient reduction of coercive force. The other model was the incoherent rotation model considering decrease of intra-grain exchange coupling. This model could reproduce the coercive force of an experiment well. In case of the intra-grain exchange coupling A=0.15x10^<-11>J/m, we obtained Hο/Hκ=0.23, which was in agreement with the actual CoCrPtB film. We found that it is necessary to increase the number of division of the particle in the direction of magnetic layer with decreasing the value of A.
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  • Aerodynamic Vibration Mechanism of HDD Arms by Unsteady Analysis and Experiments
    Naozumi TSUDA, Hiroyuki KUBOTERA, Masayuki TATEWAKI, Shigeho NODA, Mas ...
    Article type: Article
    Session ID: MMS2003-18
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In this work, we investigated the flow structure around actuator arms with and without a weight-saving hole, and clarified the unsteady flow in detail. We found that a three-dimensional spiral vortex in the wake region of the arm and the flow spilled from the weight-saving hole. These flows can be considered to be an excitation source for the actuator arm. The power spectrum of the arm torque generated by calculated wind disturbance agrees with that of measured wind disturbance. This verifies the existence of the calculated vortices and the flow spilled from the weight-saving hole.
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  • Robust control system design of PZT micro actuator
    Masahiro Kido, Shigeki Mori, Akihiro Naganawa, Yotsugi Shibuya, Goro O ...
    Article type: Article
    Session ID: MMS2003-19
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Increasing track density (TPI) is effective to realize an ultra-high density magnetic recording. As a very narrow track width of a magnetic head is required for the high TPI, a spin-stand system must follow precisely on narrow tracks. Though the spin-stand system owes accuracy to its large mechanical stiffness, the system will be difficult to follow on the narrow t rack w ithin 1 nm track e rror. Therefore, w e p ropose a p recise t racking a ctuator for the spin-stand system like a piggyback actuator. The actuator consists of a piezoelectric element and an expansion mechanism, the actuator control system is built by using a DSP system and an optical fiber displacement sensor. Since the track follow control on the spin-stand must allow various sizes of HGA without servo tuning, we approach a robust controller based on H∞ control theory.
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  • Thin Film Piezoelectric Dual-stage Actuator for HDD
    Hirokazu UCHIYAMA, Yuko OGAWA, Hiroyuki KITA, Hideki KUWAJIMA
    Article type: Article
    Session ID: MMS2003-20
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A new dual-stage actuator for positioning a magnetic head for high-density hard disk drives (HDDs) was proposed and developed. This dual-stage actuator device was characterized by applying the sputter-deposited thin film PZT, instead of the previously proposed bulk type PZT. The device performance was found outstanding with the peak -to-peak head displacement of 1.1 microns at the applied voltage of +/- 5 volts, and the suspension resonance frequency over 15 kHz.
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  • 1.6Gbps R/W pre-Amplifier for 3.5"Hard Disk Drives
    Hiroyasu Yoshizawa, Youichirou Kobayashi, Toshio Shinomiya, Masaki Yos ...
    Article type: Article
    Session ID: MMS2003-21
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Hard Disk LSI Gr., Mixed Signal LSI Development Dept, Hitachi, Ltd. Device Development Center R/W 1C is a Front/End 1C to directly give/receive the data to/from head device in Hard Disk Drive system. In this area, it becomes important to achieve both the high data transfer rate and the high reliability of MR head on cross talk or BSD. This paper describes the R/W 1C that is satisfied with both 1.6Gbps data transfer rate and high reliability with current biased/current sensed READER and symmetry differential output and GND common level WRITER circuits.
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  • Wireless Pocket Server "HOPBIT" : Bluetooth wireless HDD
    Takao OHMI, Seiji KAWAGOE
    Article type: Article
    Session ID: MMS2003-22
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_29
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Bluetooth DISK "HOPBIT" saves data to a 5GB 1.8-inch HDD able to store almost 37 hours of MPEG4 moving images or 1,000 pieces of music, however it is small enough and light enough to slip into a shirt pocket. Integration of Bluetooth is expected to promote wide for HOPBIT, as it allows wireless downloads, uploads and transfers among a wide range of Bluetooth -enabled products, including TVs, cellular phones, PDAs, PCs and digital cameras. HOPBIT will allow users to capture and save data as diverse as TV broadcasts, music files or map information and download them to a PC or PDA, allowing anytime access to stored data. HOPBIT opens the way to wireless data transmission across a wide range of digital products and is expected to promote the development of wireless mobile networks.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: February 14, 2003
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.27.13.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
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