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A Study of High Performance Signal Processing Schemes Adapted for Energy Assist Magnetic Recording Systems

Research Project

Project/Area Number 16K06313
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Electron device/Electronic equipment
Research InstitutionKogakuin University

Principal Investigator

SAITO Hidetoshi  工学院大学, 先進工学部, 教授 (60274338)

Co-Investigator(Kenkyū-buntansha) 赤城 文子  工学院大学, 先進工学部, 教授 (30726724)
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords磁気ディスク装置 / 熱アシスト磁気記録方式 / マイクロ波アシスト磁気記録方式 / マイクロマグネティクスシミュレーション / 二次元磁気記録方式 / ビットパターン媒体 / 二次元パーシャルレスポンス方式 / 二次元記録符号 / 高密度ディジタル磁気記録 / ビットパターン媒体を用いる磁気記録方式 / 熱アシスト磁気記録とビットパターン媒体記録方式 / 一般化パーシャルレスポンス方式 / ビットパターン媒体を用いる熱アシスト磁気記録方式 / 磁気記録 / 磁性 / 電子・電気材料 / 情報システム / 電子デバイス・機器
Outline of Final Research Achievements

[Head and media] We investigated heated dot magnetic recording (HDMR) and microwave assisted magnetic recording (MAMR) methods to achieve high recording density. As a result, we found that the areal recording density about 5.9 Tb/in^2 is achievable for HDMR. In this study, we show that MAMR needs a spin-torque oscillator (STO) to decrease static magnetic field from medium to the STO and increase in-plane magnetic field.
[Signal processing] We investigated high signal processing schemes for heat assisted magnetic recording (HAMR) and bit patterned media recording (BPMR) systems to achieve high recording density. As a result, we clear relations between grain size distributions for recording media and the bit error rate performances using a HAMR system with the areal recording density about 2.5 Tb/in^2. Furthermore, we propose new two-dimensional recording codes for a BPMR system with the areal recording density about 4.0 Tb/in^2 and show the block error rate performances of these codes.

Academic Significance and Societal Importance of the Research Achievements

大容量磁気ディスク装置のための新しいエネルギーアシスト磁気記録方式について、高記録密度化の可能性を検討した。本研究を通して、主にエネルギーアシスト磁気記録方式の有力な候補として、ビットパターン媒体を用いた磁気記録方式、熱アシスト磁気記録方式、熱アシスト磁気記録とビットパターン媒体を組合せた記録方式、マイクロ波アシスト磁気記録方式の各方式を検討することで、各方式の実現性と得失の一部を明らかとしている。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report

Research Products

(44 results)

All 2019 2018 2017 2016 Other

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results,  Acknowledgement Compliant: 2 results) Presentation (33 results) (of which Int'l Joint Research: 17 results,  Invited: 3 results) Remarks (4 results)

  • [Journal Article] Effects of Anisotropy Field and Easy Axis Dispersions on Squareness Ratio for HDDR-Processed Nd-Fe-B Powders2018

    • Author(s)
      F. Akagi, T. Shirai, R. Kariya
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 54 Pages: 1-5

    • DOI

      10.1109/tmag.2018.2836149

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Concatenated Coding Schemes for High Areal Density Bit-Patterned Media Magnetic Recording2018

    • Author(s)
      H. Saito
    • Journal Title

      IEEE Trans. Magn.

      Volume: 54 Pages: 1-10

    • DOI

      10.1109/tmag.2017.2746339

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effects of Head-field and AC-field on Magnetization Reversal for Microwave Assisted Magnetic Recording2018

    • Author(s)
      A. Kase, F. Akagi and K. Yoshida
    • Journal Title

      AIP Advances

      Volume: 8 Pages: 1-6

    • DOI

      10.1063/1.5005078

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects of Anisotropy Field Dispersion and Grain Boundary on Coercivity and Squareness Ratio for HDDR-Processed NdFeB Powder2018

    • Author(s)
      F. Akagi and Y. Ishii
    • Journal Title

      AIP Advances

      Volume: 8 Pages: 1-5

    • DOI

      10.1063/1.5005047

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Polar Channel Coding Schemes for Two-Dimensional Magnetic Recording Systems2017

    • Author(s)
      H. Saito
    • Journal Title

      IEEE Trans. Magn.

      Volume: 53 Pages: 1-7

    • DOI

      10.1109/tmag.2017.2705579

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Multi-Track Joint Decoding Schemes Using Two-Dimensional Run-Length Limited Codes for Bit-Patterned Media Magnetic Recording2016

    • Author(s)
      H. Saito
    • Journal Title

      IEICE Trans. Fundamentals

      Volume: E99-A Issue: 12 Pages: 2248-2255

    • DOI

      10.1587/transfun.e99.a.2248

      10.1587/transfun.E99.A.2248

    • NAID

      130005170507

    • ISSN
      0916-8508, 1745-1337
    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] マイクロ波アシスト磁気記録におけるスピントルク磁界のFGL印加領域の検討2016

    • Author(s)
      古賀理樹, 赤城文子 ,吉田和悦
    • Journal Title

      電子情報通信学会論文誌 C

      Volume: J99-C Pages: 476-482

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Two-Dimensional Magnetic Recording Systems with CRC-concatenated Polar Channel Coding Schemes2019

    • Author(s)
      H. Saito
    • Organizer
      12th International ITG Conference on Systems, Communications and Coding (SCC 2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MAMRにおいて記録媒体からSTOへの静磁界が記録に与える影響2019

    • Author(s)
      栗田佳典, 赤城文子,吉田和悦
    • Organizer
      2019年電子情報通信学会総合大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 熱アシスト磁気記録において高記録密度化達成のための媒体のドット間空隙とドット径のばらつきの検討2019

    • Author(s)
      松島直史, 赤城文子
    • Organizer
      2019年電子情報通信学会総合大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Two-dimensional Signal Processing Systems Using CRC polar Coding and List Decoding for Bit-patterned Magnetic Recording2018

    • Author(s)
      H. Saito
    • Organizer
      The 2018 IEEE International Magnetics Conference (Intermag 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 確率伝播復号を用いたPolar符号の性能改善に関する検討2018

    • Author(s)
      米澤慎一, 斎藤秀俊
    • Organizer
      第41回情報理論とその応用シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] Effects of Anisotropy Field and Easy Axis Dispersions on Squareness Ratio for HDDR-Processed Nd-Fe-B Powders2018

    • Author(s)
      F. Akagi, T. Shirai, R. Kariya
    • Organizer
      The 2018 IEEE International Magnetics Conference (Intermag 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Improving Performance of Transposition Algorithm of 3-D Data Array for Parallelization Using Message Passing Interface2018

    • Author(s)
      M. Arai, F. Akagi, S. Yamaguchi, K. Yoshida
    • Organizer
      The Sixth International Symposium on Computing and Networking (CANDAR 2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 負の磁気異方性をもつFGLとデュアルSIL構造が注入電流密度に与える低減効果2018

    • Author(s)
      栗田佳典,崔宰榮,加瀬愛菜, 赤城文子,吉田和悦
    • Organizer
      2018年 国際ディスクフォーラム
    • Related Report
      2018 Annual Research Report
  • [Presentation] Near Field Transducer for Heat Assisted Magnetic Recording2018

    • Author(s)
      吾妻滉太, 赤城文子
    • Organizer
      COMSOL Conference Tokyo 2018
    • Related Report
      2018 Annual Research Report
  • [Presentation] Performance Improvement of Calculation of Static Magnetic Field of Micromagnetic Simulator Using Supercomputer FX102018

    • Author(s)
      M. Arai, F. Akagi, S. Yamaguchi and K. Yoshida
    • Organizer
      HPC Asia 2018
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] MAMRにおけるSTOのダンピング定数とアシスト効果の関係2018

    • Author(s)
      加瀬愛菜, 赤城文子, 吉田和悦
    • Organizer
      2018年電子情報通信学会総合大会
    • Related Report
      2017 Research-status Report
  • [Presentation] マイクロ波アシスト磁気記録方式においてFGLの負の磁気異方性定数が発振磁界に与える影響2018

    • Author(s)
      崔宰榮, 加瀬愛菜, 赤城文子, 吉田和悦
    • Organizer
      2018年電子情報通信学会総合大会
    • Related Report
      2017 Research-status Report
  • [Presentation] デュアルSIL構造をもつSTOにおいて注入電流密度低減のためのSILの飽和磁化及び膜厚2017

    • Author(s)
      加瀬愛菜, 上村朋子, 赤城文子, 吉田和悦
    • Organizer
      信学会2017年総合大会
    • Place of Presentation
      名城大学, 名古屋
    • Year and Date
      2017-03-22
    • Related Report
      2016 Research-status Report
  • [Presentation] ECCドットビットパターン媒体を用いた熱アシスト磁気記録方式におけるヘッド磁界強度低減の検討2017

    • Author(s)
      金留裕介, 赤城文子
    • Organizer
      信学会2017年総合大会
    • Place of Presentation
      名城大学, 名古屋
    • Year and Date
      2017-03-22
    • Related Report
      2016 Research-status Report
  • [Presentation] 熱アシスト磁気記録におけるパーシャルレスポンス信号処理方式の検討2017

    • Author(s)
      上杉将, 斎藤秀俊, 赤城文子
    • Organizer
      信学会2017年総合大会
    • Place of Presentation
      名城大学, 名古屋
    • Year and Date
      2017-03-22
    • Related Report
      2016 Research-status Report
  • [Presentation] Multi-track Recording Systems Using Non-binary Error Correction Coding Schemes for Bit-patterned Magnetic Recording2017

    • Author(s)
      H. Saito
    • Organizer
      11th International ITG Conference on Systems, Communications and Coding (SCC 2017)
    • Place of Presentation
      Hamburg, Germany
    • Year and Date
      2017-02-06
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Two-dimensional Signal Processing Schemes for High Areal Density Bit-patterned Media Magnetic Recording Based on Channel Polarization2017

    • Author(s)
      H. Saito
    • Organizer
      The 2017 IEEE International Magnetics Conference (Intermag Europe 2017)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Two-dimensional Magnetic Recording Schemes Using Channel Polarization2017

    • Author(s)
      H. Saito
    • Organizer
      The 28th Magetic Recording Conference (TMRC 2017)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Error-correction Coding for Two-dimensional Magnetic Recording Using Bit-patterned Media2017

    • Author(s)
      H. Saito
    • Organizer
      The 40th Symposium on Information Theory and its Applications (SITA2017)
    • Related Report
      2017 Research-status Report
  • [Presentation] A Method of Selecting Frozen Bits for Belief Propagation Decoding of Polar Codes2017

    • Author(s)
      S. Yonezawa and H. Saito
    • Organizer
      The 16th International Symposium on Advanced Technology (ISAT-16)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Study on Partial Response Equalization Systems for Heat Assisted Magnetic Recording2017

    • Author(s)
      S. Uesugi, H. Saito and F. Akagi
    • Organizer
      The 16th International Symposium on Advanced Technology (ISAT-16)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] デュアルSIL構造をもつSTOにおいて注入電流密度低減のためのSILの飽和磁化及び膜厚2017

    • Author(s)
      加瀬愛菜, 上村朋子, 赤城文子, 吉田和悦
    • Organizer
      電子情報通信学会 磁気記録・情報ストレージ研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] デュアルSIL構造をもつSTOにおいて注入電流密度低減のためのSILの飽和磁化及び膜厚2017

    • Author(s)
      加瀬愛菜, 上村朋子, 赤城文子, 吉田和悦
    • Organizer
      電子情報通信学会 磁気記録・情報ストレージ研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] Relation Between High-Frequency AC Field and Heat Generated by Eddy Current2017

    • Author(s)
      M. Ishikawa and F. Akagi
    • Organizer
      The 16th International Symposium on Advanced Technology (ISAT-16)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Calculation Model of Magneto-Impedance Sensor Using Amorphous Wires2017

    • Author(s)
      H. Ohta and F. Akagi
    • Organizer
      The 16th International Symposium on Advanced Technology (ISAT-16)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effects of Anisotropy Field Dispersion and Grain Boundary on Coercivity and Squareness Ratio for HDDR-Processed NdFeB Powders2017

    • Author(s)
      F. Akagi and Y. Ishii
    • Organizer
      2017 MMM Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Effects of Head-field and AC-field on Magnetization Rversal for Microwave Assisted Magnetic Recording2017

    • Author(s)
      A. Kase, F. Akagi and K. Yoshida
    • Organizer
      2017 MMM Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Study of Designing Modulation Codes for Two-Dimensional Magnetic Recording Using Channel Polarization2016

    • Author(s)
      H. Saito
    • Organizer
      The 39th Symposium on Information Theory and its Applications (SITA2016)
    • Place of Presentation
      Takayama, Gifu
    • Year and Date
      2016-12-17
    • Related Report
      2016 Research-status Report
  • [Presentation] High Areal Density Digital Magnetic Recording Schemes Based on Heat Assisted Magnetic Recording2016

    • Author(s)
      S. Uesugi, Hidetoshi Saito, and F. Akagi
    • Organizer
      The 15th International Symposium on Advanced Technology (ISAT-15)
    • Place of Presentation
      Tainan, Taiwan
    • Year and Date
      2016-11-10
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Study of New Two-dimensional Signal Processing Schemes for Bit Patterned Magnetic Recording2016

    • Author(s)
      H. Saito
    • Organizer
      The 15th International Symposium on Advanced Technology (ISAT-15)
    • Place of Presentation
      Tainan, Taiwan
    • Year and Date
      2016-11-10
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 熱アシスト磁気記録に対するディジタル信号処理方式の一検討2016

    • Author(s)
      上杉将,斎藤秀俊,赤城文子
    • Organizer
      信学会2016年ソサイエティ大会
    • Place of Presentation
      北海道大学 札幌
    • Year and Date
      2016-09-20
    • Related Report
      2016 Research-status Report
  • [Presentation] Effects of deterioration of grain surface-layer and grain boundary on magnetic property for neodymium permanent magnet2016

    • Author(s)
      F. Akagi, Y. Sakai and Y. Honkura
    • Organizer
      The 40th Annual Conference on MAGNETICS in Japan
    • Place of Presentation
      金沢大学, 金沢
    • Year and Date
      2016-09-05
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Two-Dimensional Modulation Codes Using Polar Coding Techniques2016

    • Author(s)
      H. Saito
    • Organizer
      2016 IEEE Magnetic Recording Conference (The 27th Magnetic Recording Conference, TMRC 2016)
    • Place of Presentation
      Stanford, CA, U.S.A.
    • Year and Date
      2016-08-17
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 工学院大学 先進工学部 応用物理学科 磁性応用研究室

    • URL

      http://www.ns.kogakuin.ac.jp/~wwa1065/index.html

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
  • [Remarks] 工学院大学 大学・大学院紹介 教員について(斎藤秀俊)

    • URL

      http://er-web.sc.kogakuin.ac.jp/Profiles/6/0000545/profile.html

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
  • [Remarks] 工学院大学 大学・大学院紹介 教員について(赤城文子)

    • URL

      https://er-web.sc.kogakuin.ac.jp/Profiles/11/0001063/profile.html

    • Related Report
      2018 Annual Research Report
  • [Remarks] 工学院大学 大学・大学院紹介 教員について(赤城文子)

    • URL

      http://er-web.sc.kogakuin.ac.jp/Profiles/11/0001063/profile.html

    • Related Report
      2017 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2020-03-30  

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