ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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26.65
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • A Study of Neural Network Equalization in Perpendicular Magnetic Recording Channel with MR Nonlinear Distortion
    Hisashi OSAWA, Takumi NAKAOKA, Toshimasa SHIMIZU, Yoshihiro OKAMOTO, H ...
    Article type: Article
    Session ID: MMS2002-64
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The neural network equalization in perpendicular magnetic recording channel with jitter-like media noise and MR nonlinear distortion is studied. A method of simplification of neural network using a hybrid genetic algorithm (GA) is proposed. Then, the bit error rate performance for PR2ML system with a simplified neural network equalizer is obtained and compare with those of conventional neural network and transversal filter equalizers. The results show that the SNR improvements of PR2ML system with simplified neural network equalizer over PR2ML system with conventional neural network equalizer and transversal filter equalizer are about 1.0 and 1.5dB, respectively.
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  • A study of post-processor for PRML system using parity code
    Yoshihiro OKAMOTO, Sho FUNANO, Hisashi OSAWA, Hidetoshi SAITO, Hiroaki ...
    Article type: Article
    Session ID: MMS2002-65
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The effective signal processing system for jitter-like medium noise is required in a perpendicular magnetic recording. In this paper, a post-processor is studied for PRML system using AR (Autoregressive) channel model which has a good performance in the perpendicular magnetic recording system where jitter-like medium noise is dominant. An interleaved parity check coding to search an error event and the method to identify the position of the error are proposed. Furthermore, the performance is evaluated in a real channel on a spinstand with a read/write head, which consist of a single pole type head and a GMR head, and a perpendicular recording medium. The results show that the linear density of our system improves about 16% (100kBPI) compared with that of the conventional PR1ML system.
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  • Analysis of Bit-shift Characteristics of Doubled-layer for Perpendicular Magnetic Recording : The Influences of Soft-under-layer on Bit-shift Characteristics
    Kazuetsu Yoshida
    Article type: Article
    Session ID: MMS2002-66
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_13
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The properties of the magnetic domains that appear in an under-layer of a double-layered medium during recording process are investigated using computer simulation. Further, their influences on recording properties are discussed. The magnetic domains are in a thermodynamically non-equilibrium state. They appear instantaneously in recording process, and they vanish immediately with the removal of recording head by thermal agitation. But the additional fields generated from the wall charges affect considerably on the bit-shift characteristics, which results in the increase of jitter noise.
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  • Thermal stability simulation of magnetic recording media
    Sachiko TAKANOSU, Tsuyoshi ABE, Naoya FUJIWARA, Kiminari SHINAGAWA
    Article type: Article
    Session ID: MMS2002-67
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
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    In order to estimate the thermal stability of a keepered medium with a soft magnetic under-layer or an antiferromagnetically coupled medium of two laminated recording layers with a thin intervening nonmagnetic layer, a finite element read/write simulation based on the Poisson equation is performed at finite temperatures on the 2D model of the medium and a thin film head system. Using a Stoner-Wohlfarth model extended at finite temperatures, the thermal stability is estimated by the difference between the output voltage at just after recording and one at quasiequilibrium state at 300K or by the time-dependence of the output voltage. As a result, it is found that both media have high thermal stability compared with the conventional media.
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  • Development of R/W Simulation System using 3-D Finite Element Method
    Naoya FUJIWARA, Kiminari SHINAGAWA, Kohei ASHIHO, Koji FUJIWARA, Norio ...
    Article type: Article
    Session ID: MMA2002-68
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_25
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Recently, higher areal recording density of HDD is achieved by increasing not only linear density (BPI) but also track density(TPI). Then, 3-D R/W simulation is necessary in order to design high-density recording system by utilizing magnetic field analysis. In this paper, 3-D R/W simulation system using edge-based finite element method is developed by introducting 3-D medium hysteresis model based on the ensemble of the Stoner-Wohlfarth (S-W) particles. As it is not easy to apply the Newton-Raphson method for the nonlinear analysis of S-W model, an under-relaxation iteration method is used. The formulation and an example of analysis are shown.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: October 04, 2002
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.26.65.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
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