Details of the Researcher

PHOTO

Greaves Simon John
Section
Research Institute of Electrical Communication
Job title
Associate Professor

Research Areas 1

  • Nanotechnology/Materials / Applied materials /

Papers 184

  1. Enhancing Bottom-Layer Detection in Dual-Layer 3-D Magnetic Recording via Top-Layer-Assisted Signal Rescaling

    Ke Luo, Yuqian Zhao, Ziqian Liu, Yugen Jian, Simon Greaves, Jincai Chen, Ping Lu

    IEEE TRANSACTIONS ON MAGNETICS　62　(3)　2026/03

    DOI： 10.1109/TMAG.2025.3601437 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  2. Inter-Layer Interference (ILI) Suppression in Dual-Layer Bit-Patterned Magnetic Recording Systems

    Natthakan Rueangnetr, Santi Koonkarnkhai, Simon John Greaves, Chanon Warisarn

    IEEE TRANSACTIONS ON MAGNETICS　62　(3)　2026/03

    DOI： 10.1109/TMAG.2025.3607374 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  3. Cubic anisotropy media for microwave assisted magnetic recording

    Simon John Greaves, Yasushi Kanai

    AIP ADVANCES　16　(2)　2026/02/01

    DOI： 10.1063/9.0000962 　

    eISSN： 2158-3226

  4. Mutual Soft-Information Improvement Techniques for Lower Layer Performance Improvement in Double-Layered Magnetic Recording Systems

    Anawin Khametong, Simon John Greaves, Chanon Warisarn

    IEEE TRANSACTIONS ON MAGNETICS　61　(9)　2025/09

    DOI： 10.1109/TMAG.2025.3544756 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  5. Feasibility Study of Implementing Simple Dual-bit Detection in Dual-Layer Bit-Patterned Magnetic Recording Systems

    Natthakan Rueangnetr, Simon John Greaves, Chanon Warisarn

    JOURNAL OF MAGNETICS　30　(3)　459-464　2025/09

    DOI： 10.4283/JMAG.2025.30.3.459 　

    ISSN： 1226-1750

    eISSN： 2233-6656

  6. Double-Track PRML Detection for Two-Track Reading with a Wide-Track Reader in Shingled Magnetic Recording Systems

    Anawin Khametong, Simon John Greaves, Chanon Warisarn

    JOURNAL OF MAGNETICS　30　(3)　465-469　2025/09

    DOI： 10.4283/JMAG.2025.30.3.465 　

    ISSN： 1226-1750

    eISSN： 2233-6656

  7. Enhancing Log-Likelihood Ratios with Mutual Information on Three-Reader One-Track Detection in Staggered BPMR Systems

    Natthakan Rueangnetr, Santi Koonkarnkhai, Piya Kovintavewat, Simon John Greaves, Chanon Warisarn

    APPLIED SCIENCES-BASEL　15　(5)　2025/03

    DOI： 10.3390/app15052329 　

    eISSN： 2076-3417

  8. Simulation of error rate of and logic gates made with stochastic MTJs

    So Endo, Simon John Greaves

    AIP ADVANCES　15　(3)　2025/03

    DOI： 10.1063/9.0000875 　

    eISSN： 2158-3226

  9. Enhancing Signal Processing With Multilayer Perceptron Utilization for Bit-Patterned Magnetic Recording

    Natthakan Rueangnetr, Simon John Greaves, Chanon Warisarn

    IEEE ACCESS　13　186843-186855　2025

    DOI： 10.1109/ACCESS.2025.3626853 　

    ISSN： 2169-3536

  10. Improvement of Dual-Layer HAMR Recording Conditions Using SMR

    Yasuaki Nakamura, Madoka Nishikawa, Simon John Greaves, Yasushi Kanai, Yoshihiro Okamoto

    IEEE Transactions on Magnetics　62　(3)　1-1　2025

    DOI： 10.1109/tmag.2025.3600399 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  11. Optimization of Layer Thicknesses for Dual-Layer Bit-Patterned Media Recording (BPMR) Systems

    Natthakan Rueangnetr, Chanon Warisarn, Simon John Greaves

    IEEE TRANSACTIONS ON MAGNETICS　60　(9)　2024/09

    DOI： 10.1109/TMAG.2024.3410296 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  12. A study on HAMR read/write channel models for double layer magnetic recording

    Yasuaki Nakamura, Madoka Nishikawa, Simon J. Greaves, Yasushi Kanai, Yoshihiro Okamoto

    Japanese Journal of Applied Physics　63　(8)　08SP11-08SP11　2024/08/01

    DOI： 10.35848/1347-4065/ad6b9f 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  13. Dual-layer FePt-C granular media for multi-level heat-assisted magnetic recording

    P. Tozman, S. Isogami, I. Suzuki, A. Bolyachkin, H. Sepehri-Amin, S.J. Greaves, H. Suto, Y. Sasaki, T.Y. Chang, Y. Kubota, P. Steiner, P.W. Huang, K. Hono, Y.K. Takahashi

    Acta Materialia　271　119869-119869　2024/06

    Publisher: Elsevier BV

    DOI： 10.1016/j.actamat.2024.119869 　

    ISSN： 1359-6454

  14. Architecture Optimization of a CNN Media Noise Estimator for TDMR

    Jorge Pires, Amirhossein Sayyafan, Benjamin J. Belzer, Krishnamoorthy Sivakumar, Simon Greaves

    IEEE TRANSACTIONS ON MAGNETICS　60　(5)　2024/05

    DOI： 10.1109/TMAG.2023.3325899 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  15. Write Head Design for Control of Transition Curvature in Heat-Assisted Magnetic Recording

    Simon John Greaves, Keita Tatsuno, Yasushi Kanai

    IEEE Transactions on Magnetics　60　(5)　1-5　2024/05

    DOI： 10.1109/tmag.2023.3319459 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  16. Optimization of Layer Thicknesses for Dual-Layer Bit-Patterned Media Recording (BPMR) Systems

    Natthakan Rueangnetr, Chanon Warisarn, Simon John Greaves

    2024 IEEE INTERNATIONAL MAGNETIC CONFERENCE-SHORT PAPERS, INTERMAG SHORT PAPERS　2024

    DOI： 10.1109/INTERMAGSHORTPAPERS61879.2024.10576994 　

  17. A New Dual FGL STO for MAMR

    Yasushi Kanai, Keita Tatsuno, Simon J. Greaves

    IEEE Transactions on Magnetics　61　(4)　1-1　2024

    DOI： 10.1109/tmag.2024.3511629 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  18. Optimisation of microwave-assisted magnetic recording media for spin-torque oscillators with dual field generating layers

    Simon John Greaves, Yasushi Kanai

    IEEE Transactions on Magnetics　61　(4)　1-1　2024

    DOI： 10.1109/tmag.2024.3472048 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  19. Effect of Curie Temperature Distributions on the User Areal Density of Heat-Assisted Magnetic Recording

    Simon John Greaves, Hirofumi Suto, Yasuaki Nakamura, Yasushi Kanai

    IEEE Transactions on Magnetics　60　(9)　1-1　2024

    DOI： 10.1109/tmag.2024.3400615 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  20. Three-dimensional magnetic recording

    Simon Greaves

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　588　2023/12/15

    DOI： 10.1016/j.jmmm.2023.171343 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  21. Controlling Information Flow in Arrays of Spin-Torque Oscillators

    Tsubasa Ise, Simon John Greaves, Yoichiro Tanaka

    IEEE Transactions on Magnetics　59　(11)　1-5　2023/11

    DOI： 10.1109/tmag.2023.3294515 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  22. Convolutional Neural Network-Based Media Noise Prediction and Equalization for TDMR Turbo-Detection With Write/Read TMR

    Amirhossein Sayyafan, Ahmed Aboutaleb, Benjamin J. Belzer, Krishnamoorthy Sivakumar, Simon Greaves, Kheong Sann Chan, Ashish James

    IEEE TRANSACTIONS ON MAGNETICS　59　(3)　2023/03

    DOI： 10.1109/TMAG.2022.3216640 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  23. Writing domains in nanowires using a spin torque oscillator

    Simon John Greaves, Yoshiaki Sonobe

    AIP ADVANCES　13　(2)　2023/02/01

    DOI： 10.1063/9.0000459 　

    eISSN： 2158-3226

  24. Blocking phenomenon of hard/soft bilayer L10–FePt grains in granular film

    Daiki Isurugi, Takashi Saito, Kim Kong Tham, Tomoyuki Ogawa, Yoichiro Tanaka, Simon John Greaves, Shin Saito

    IEEE Transactions on Magnetics　59　(11)　1-1　2023

    DOI： 10.1109/tmag.2023.3296155 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  25. Micromagnetic model analysis of dual field generation layer (FGL) spin torque oscillators (STO) for microwave-assisted magnetic recording (MAMR)

    Ryo Itagaki, Yasushi Kanai, Simon Greaves

    International Journal of Applied Electromagnetics and Mechanics　71　S1-S11　2022/12/12

    DOI： 10.3233/jae-220146 　

    ISSN： 1383-5416

    eISSN： 1875-8800

  26. Turbo-Detection for Multilayer Magnetic Recording Using Deep Neural Network-Based Equalizer and Media Noise Predictor

    Amirhossein Sayyafan, Ahmed Aboutaleb, Benjamin J. Belzer, Krishnamoorthy Sivakumar, Simon Greaves, Kheong Sann Chan

    IEEE TRANSACTIONS ON MAGNETICS　58　(4)　2022/04

    DOI： 10.1109/TMAG.2021.3122136 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  27. Optimization of Soft Layer Uniaxial Anisotropy Gradient in Media for Microwave-Assisted Magnetic Recording

    Simon John Greaves, Ryo Itagaki, Yasushi Kanai

    IEEE Transactions on Magnetics　58　(4)　1-9　2022/04

    DOI： 10.1109/tmag.2021.3128644 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  28. Increasing the Correlation Time of Spin-Torque Oscillators Synchronized by Magnetostatic Interactions

    Simon John Greaves

    IEEE TRANSACTIONS ON MAGNETICS　58　(2)　2022/02

    DOI： 10.1109/TMAG.2021.3079929 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  29. Hysteresis loops of recording media grains under the influence of high frequency fields

    Simon John Greaves, Yasushi Kanai

    IEEE Transactions on Magnetics　59　(3)　1-1　2022

    DOI： 10.1109/tmag.2022.3220717 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  30. Optimising the Thickness and Diameter of Dual Structure Patterned Media Dots for Heat Assisted Magnetic Recording

    Hikaru Yamane, Simon John Greaves, Yoichiro Tanaka

    IEEE Transactions on Magnetics　58　(8)　1-1　2022

    DOI： 10.1109/tmag.2022.3144982 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  31. Transforming domain motion for 3D racetrack memory with perpendicular magnetic anisotropy Peer-reviewed

    Syuta Honda, Yoshiaki Sonobe, Simon John Greaves

    Journal of Physics D: Applied Physics　54　(13)　135002-135002　2021/04/01

    DOI： 10.1088/1361-6463/abd060 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  32. Deep Neural Network-Based Detection and Partial Response Equalization for Multilayer Magnetic Recording

    Ahmed Aboutaleb, Amirhossein Sayyafan, Krishnamoorthy Sivakumar, Benjamin Belzer, Simon Greaves, Kheong Sann Chan, Roger Wood

    IEEE Transactions on Magnetics　57　(3)　2021/03/01

    DOI： 10.1109/TMAG.2020.3038435 　

    ISSN： 1941-0069 0018-9464

    eISSN： 1941-0069

  33. Effect of FGL Cone Angle on Recording Performance in Microwave-Assisted Magnetic Recording

    Simon John Greaves, Ryo Itagaki, Yasushi Kanai

    IEEE Transactions on Magnetics　57　(3)　1-6　2021/03

    DOI： 10.1109/tmag.2020.3036382 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  34. Heat-Assisted Magnetic Recording on Dual Structure Bit Patterned Media

    Hikaru Yamane, Simon John Greaves, Yoichiro Tanaka

    IEEE Transactions on Magnetics　57　(2)　1-6　2021/02

    DOI： 10.1109/tmag.2020.3020088 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  35. Optimisation of dual structure recording media for microwave-assisted magnetic recording

    Simon John Greaves, Yasushi Kanai

    AIP Advances　10　(12)　125130-125130　2020/12/01

    DOI： 10.1063/9.0000029 　

    eISSN： 2158-3226

  36. Effect of spin torque oscillator cone angle on recording performance in microwave assisted magnetic recording

    S. J. Greaves, R. Itagaki, Y. Kanai

    2020 IEEE 31st Magnetic Recording Conference, TMRC 2020　2020/08/17

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/TMRC49521.2020.9366716 　

  37. Dual-structure microwave-assisted magnetic recording using only a spin torque oscillator

    Simon John Greaves, Waka Saito

    AIP Advances　9　(12)　2019/12/01

    DOI： 10.1063/1.5129724 　

    ISSN： 2158-3226

    eISSN： 2158-3226

  38. Areal density capability of dual-structure media for microwave-assisted magnetic recording International-journal International-coauthorship Peer-reviewed

    S. J. Greaves, K. S. Chan, Y. Kanai

    IEEE Trans. on Magn.　55　(12)　6701509　2019/12

    DOI： 10.1109/TMAG.2019.2936579 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  39. Stable oscillation of spin-torque oscillator with reduced injected current density for microwave-assisted magnetic recording International-journal Peer-reviewed

    Y. Kanai, R. Itagaki, S. Greaves

    64th Annual Conference on Magnetism and Magnetic Materials (MMM 2019), Las Vegas, NV, U.S.A.　GR-08　2019/11

  40. Optimization of the 3-D-MAMR Media Stack Peer-reviewed

    Chan Kheong Sann, Greaves Simon, Rahardja Susanto

    IEEE TRANSACTIONS ON MAGNETICS　55　(9)　2019/09

    DOI： 10.1109/TMAG.2019.2916748 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  41. A Model for Predicting Transition Curvature in Heat-Assisted Magnetic Recording Peer-reviewed

    Greaves Simon John, Itagaki R, Kanai Yasushi

    IEEE TRANSACTIONS ON MAGNETICS　55　(7)　2019/07

    DOI： 10.1109/TMAG.2018.2885990 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  42. Optimization of Dual-Structure Recording Media for Microwave-Assisted Magnetic Recording Peer-reviewed

    Greaves Simon John, Chan Kheong Sann, Kanai Yasushi

    IEEE TRANSACTIONS ON MAGNETICS　55　(7)　2019/07

    DOI： 10.1109/TMAG.2018.2889317 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  43. Effect of Spin-Torque Oscillator Tilt Angle in Microwave-Assisted Magnetic Recording Peer-reviewed

    Greaves Simon John, Kanai Yasushi

    IEEE TRANSACTIONS ON MAGNETICS　55　(3)　2019/03

    DOI： 10.1109/TMAG.2018.2868279 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  44. Micromagnetic Model Simulations Considering Write Head, Spin-Torque Oscillator, and Double-Layered Medium Altogether Peer-reviewed

    Kanai Yasushi, Itagaki Ryo, Greaves Simon J, Muraoka Hiroaki

    IEEE TRANSACTIONS ON MAGNETICS　55　(3)　2019/03

    DOI： 10.1109/TMAG.2018.2869208 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  45. Micromagnetic Model Simulation of Spin-Torque Oscillator and Write Head for Microwave-Assisted Magnetic Recording - Spin Injection Layer with In-Plane Anisotropy - Peer-reviewed

    Kanai Yasushi, Itagaki Ryo, Greaves Simon, Muraoka Hiroaki

    APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL　34　(2)　226-227　2019/02

    ISSN： 1054-4887

    eISSN： 1943-5711

  46. Correction of transition curvature for shingled, heat assisted magnetic recording International-journal Peer-reviewed

    S. Greaves, R. Itagaki, Y. Kanai

    2019 Joint MMM-INTERMAG Conference, EK-08, Washington, DC, U.S.A.　2019/01

  47. Micromagnetic model simulation of spin-torque oscillator and write head for microwave-assisted magnetic recording - Spin injection layer with in-plane anisotropy - Spin i

    Yasushi Kanai, Ryo Itagaki, Simon Greaves, Hiroaki Muraoka

    Applied Computational Electromagnetics Society Journal　34　226-227　2019/01/01

    ISSN： 1054-4887

  48. Techniques for Addressing Saddle Points in the Response Surface Methodology (RSM) Peer-reviewed

    Chan Kheong Sann, Greaves Simon J, Rahardja Susanto

    IEEE ACCESS　7　85613-85621　2019

    DOI： 10.1109/ACCESS.2019.2922975 　

    ISSN： 2169-3536

  49. Micromagnetic Model Analysis of Spin-Torque Oscillator (STO) Integrated Into Recording Head for Microwave-Assisted Magnetic Recording-Oscillation of STO Versus Rise Time of In-Gap Field Peer-reviewed

    Kanai Yasushi, Itagaki Ryo, Greaves Simon J, Muraoka Hiroaki

    IEEE TRANSACTIONS ON MAGNETICS　54　(11)　2018/11

    DOI： 10.1109/TMAG.2018.2848279 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  50. Magnetic Recording Using a Spin Torque Oscillator Peer-reviewed

    Greaves Simon John

    IEEE TRANSACTIONS ON MAGNETICS　54　(11)　2018/11

    DOI： 10.1109/TMAG.2018.2834933 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  51. Optimizing Dual-Layer Recording Using Antiferromagnetic Exchange Coupling Peer-reviewed

    Greaves Simon John, Kikuchi Tadahiro, Kanai Yasushi, Muraoka Hiroaki

    IEEE TRANSACTIONS ON MAGNETICS　54　(11)　2018/11

    DOI： 10.1109/TMAG.2018.2829509 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  52. Micromagnetic model analysis spin-torque oscillator and write head for microwave-assisted magnetic recording International-journal Invited Peer-reviewed

    Y. Kanai, R. Itagaki, S. Greaves, H. Muraoka

    XX-th International Symposium on Electrical Apparatus and Technologies SIELA 2018, Bourgas, Bulgaria　2018/06

  53. Micromagnetic model simulation of spin-torque oscillator and write head for microwave-assisted magnetic recording - Spin injection layer with in-plane anisotropy Peer-reviewed

    Yasushi Kanai, Ryo Itagaki, Simon Greaves, Hiroaki Muraoka

    2018 International Applied Computational Electromagnetics Society Symposium in Denver, ACES-Denver 2018　2018/05/23

    DOI： 10.23919/ROPACES.2018.8364203 　

  54. Magnetisation switching of ECC grains in microwave-assisted magnetic recording Peer-reviewed

    Simon John Greaves, Hiroaki Muraoka, Yasushi Kanai

    AIP Advances　8　(5)　2018/05/01

    DOI： 10.1063/1.5006362 　

    ISSN： 2158-3226

    eISSN： 2158-3226

  55. Antiferromagnetically Coupled Media for Microwave-Assisted Magnetic Recording Peer-reviewed

    Simon Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE Transactions on Magnetics　54　(2)　2018/02/01

    DOI： 10.1109/TMAG.2017.2730881 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  56. Media Optimization for 3D Microwave-Assisted Magnetic Recording via Response Surface Methodology Peer-reviewed

    2018 ASIA-PACIFIC MAGNETIC RECORDING CONFERENCE (APMRC)　2018

  57. Micromagnetic model analysis of spin torque oscillators integrated into write head gap vs. head field response Peer-reviewed

    Y. Kanai, R. Itagaki, S. Greaves, H. Muraoka

    62nd Annual Conference on Magnetism and Magnetic Materials (2017 MMM), BQ-08, Pittsburgh, PA, U.S.A.　2017/11

  58. Microwave-assisted magnetic recording using a planar write head Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    62nd Annual Conference on Magnetism and Magnetic Materials (2017 MMM), BQ-06, Pittsburgh, PA, U.S.A.　2017/11

  59. Micromagnetic Model Analysis of Various Spin-Torque Oscillators With Write Head for Microwave-Assisted Magnetic Recording Peer-reviewed

    Yasushi Kanai, Ryo Itagaki, Simon J. Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　53　(11)　2017/11

    DOI： 10.1109/TMAG.2017.2701398 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  60. Composite Media for Heat Assisted Magnetic Recording Peer-reviewed

    Simon John Greaves, Yoshiaki Sonobe, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　53　(11)　2017/11

    DOI： 10.1109/TMAG.2017.2696561 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  61. Optimisation of applied field pulses for microwave assisted magnetic recording Peer-reviewed

    Simon John Greaves, Hiroaki Muraoka, Yasushi Kanai

    AIP ADVANCES　7　(5)　2017/05

    DOI： 10.1063/1.4978584 　

    ISSN： 2158-3226

  62. Micromagnetic Model Analysis of Spin-Transfer Torque Oscillator and Write Heads for Microwave-Assisted Magnetic Recording Peer-reviewed

    Yasushi Kanai, Kazuetsu Yoshida, Simon Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　53　(2)　2017/02

    DOI： 10.1109/TMAG.2016.2606494 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  63. Multiple Layer Microwave-Assisted Magnetic Recording Peer-reviewed

    Simon Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　53　(2)　2017/02

    DOI： 10.1109/TMAG.2016.2612244 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  64. Magnetization Switching Time of Graded Anisotropy Recording Media Grains

    Akitaya N., Greaves S., Muraoka H.

    Transaction of the Magnetics Society of Japan Special Issues　1　(1)　1-4　2017

    Publisher: The Magnetics Society of Japan

    DOI： 10.20819/msjtmsj.17TR101 　

    More details Close

    <p>A media grain with graded anisotropy is expected to have a shorter magnetization reversal time than a single layer grain due to the lower uniaxial anisotropy at one end of the grain. Here the magnetization reversal time of graded anisotropy grains is examined as a function of the anisotropy gradient and applied field and compared with single layer grains. Using graded anisotropy media the magnetization reversal time can be reduced to about 2/3 that of a single layer grain with the same damping constant. If the anisotropy gradient is increased the damping constant of the lower anisotropy part of the grain has a significant effect on the magnetization reversal time.</p>

  65. Micromagnetic model analysis of double- and tri-layered spin torque oscillators with write head for microwave-assisted magnetic recording Peer-reviewed

    Y. Kanai, R. Itagaki, S. Greaves, K. Yoshida, H. Muraoka

    61st Annual Conference on Magnetism and Magnetic Materials (2016 MMM), AQ-08, New Orleans, LA, U.S.A.　2016/10

  66. Resonance frequency distribution of ECC grains in microwave assisted magnetic recording Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    61st Annual Conference on Magnetism and Magnetic Materials (2016 MMM), AQ-07, New Orleans, LA, U.S.A.　2016/10

  67. Multiple layer microwave-assisted magnetic recording Invited Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    The 27th Magnetic Recording Conference (TMRC 2016), Stanford, CA, U.S.A.　2016/08

  68. Multiple layer magnetic recording using MAMR Invited Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    The 4th International Conference of Asian Union of Magnetics Societies (ICAUMS 2016), BB-03, Tainan, Taiwan　2016/08

  69. Microwave-Assisted Magnetic Recording on Exchange Coupled Composite Media Peer-reviewed

    Simon John Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　52　(7)　2016/07

    DOI： 10.1109/TMAG.2015.2508922 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  70. High-Frequency Magnetic Recording Using a Dual Write Head Peer-reviewed

    Naoki Akitaya, Simon John Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　52　(7)　2016/07

    DOI： 10.1109/TMAG.2015.2512593 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  71. Microwave-Assisted Magnetic Recording on Dual-Thickness and Dual-Layer Bit-Patterned Media Peer-reviewed

    Simon John Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　52　(7)　2016/07

    DOI： 10.1109/TMAG.2015.2506171 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  72. Micromagnetic Simulation of Spin-Torque Oscillator for Microwave-Assisted Magnetic Recording-Interaction Between Write Head and STO and Optimum Injected Current Peer-reviewed

    Yasushi Kanai, Takuto Katayama, Kazuetsu Yoshida, Simon Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　52　(7)　2016/07

    DOI： 10.1109/TMAG.2015.2508035 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  73. Recording on dual-layer and dual-thickness bit patterned media using microwave assisted magnetic recording Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    13th Joint MMM-Intermag Conference, FV-11, San Diego, CA, U.S.A.　2016/01

  74. Micromagnetic simulation of STO for microwave-assisted magnetic recording: Interaction of write head and STO and optimum injected current Peer-reviewed

    Y. Kanai, T. Katayama, K. Yoshida, S. Greaves, H. Muraoka

    13th Joint MMM-Intermag Conference, CV-11, San Diego, CA, U.S.A.　2016/01

  75. Areal Density Prediction for Microwave-Assisted Magnetic Recording

    K. K. Teo, K. S. Chan, S. J. Greaves, Yasushi Kanai

    IEEE TRANSACTIONS ON MAGNETICS　51　(11)　2015/11

    DOI： 10.1109/TMAG.2015.2452413 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  76. Microwave-Assisted Shingled Magnetic Recording Peer-reviewed

    Simon John Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　51　(11)　2015/11

    DOI： 10.1109/TMAG.2015.2435008 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  77. Two-Track Reading With a Wide-Track Reader for Shingled Track Recording Peer-reviewed

    Hiroaki Muraoka, Simon John Greaves

    IEEE TRANSACTIONS ON MAGNETICS　51　(11)　2015/11

    DOI： 10.1109/TMAG.2015.2454532 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  78. Micromagnetic model analysis of integrated single-pole type head with spin-torque oscillator Peer-reviewed

    Y. Kanai, Y. Tabuse, K. Yoshida, S. Greaves, H. Muraoka

    The 26th Magnetic Recording Conference (TMRC 2015), P1-18, Minneapolis, MN, U.S.A.　2015/08

  79. Micromagnetic model analysis of high frequency heat-assisted magnetic recording

    Yasushi Kanai, Simon J. Greaves, Kazuetsu Yoshida, Hiroaki Muraoka

    JOURNAL OF APPLIED PHYSICS　117　(17)　2015/05

    DOI： 10.1063/1.4908024 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  80. Simple modeling of readback response based on granular micro-structure

    T. Jin, H. Muraoka, S. J. Greaves

    JOURNAL OF APPLIED PHYSICS　117　(17)　2015/05

    DOI： 10.1063/1.4913635 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  81. Micromagnetic model analysis of integrated single-pole-type head with tilted spin-torque oscillator for high-frequency microwave-assisted magnetic recording Peer-reviewed

    Takuto Katayama, Yasushi Kanai, Kazuetsu Yoshida, Simon Greaves, Hiroaki Muraoka

    JOURNAL OF APPLIED PHYSICS　117　(17)　2015/05

    DOI： 10.1063/1.4907328 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  82. Modelling of heat assisted magnetic recording with the Landau-Lifshitz-Bloch equation and Brillouin functions Peer-reviewed

    Simon John Greaves, Hiroaki Muraoka, Yasushi Kanai

    JOURNAL OF APPLIED PHYSICS　117　(17)　2015/05

    DOI： 10.1063/1.4908025 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  83. Write synchronization for position-correlated granular media Peer-reviewed

    Akihiro Hara, Hiroaki Muraoka, Simon J. Greaves

    JOURNAL OF APPLIED PHYSICS　117　(17)　2015/05

    DOI： 10.1063/1.4916497 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  84. The Dynamics of Microwave-Assisted Magnetic Recording Peer-reviewed

    Simon Greaves, Takuto Katayama, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　51　(4)　2015/04

    DOI： 10.1109/TMAG.2014.2361751 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  85. Calculation of Magnetization Reversal Times Using the LLG Equation

    Greaves Simon

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2015　6-6　2015

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2015.0_6 　

  86. Inter-Track Interference Suppression with Array Reader for Narrow Track Recording

    Greaves Simon

    Tohoku-Section Joint Convention Record of Institutes of Electrical and Information Engineers, Japan　2015　7-7　2015

    Publisher: Organizing Committee of Tohoku-Section Joint Convention of Institutes of Electrical and Information Engineers, Japan

    DOI： 10.11528/tsjc.2015.0_7 　

  87. Micromagnetic model analysis of high-frequency thermally-assisted magnetic recording Peer-reviewed

    Y. Kanai, S. Greaves, K. Yoshida, H. Muraoka

    59th Annual Magnetism and Magnetic Materials Conference (MMM), BP-12, Honolulu, HI, U.S.A.　2014/11

  88. Micromagnetic model analysis of integrated SPT head with tilted STO for high-frequency microwave-assisted magnetic recording Peer-reviewed

    T. Katayama, Y. Kanai, K. Yoshida, S. Greaves, H. Muraoka

    59th Annual Magnetism and Magnetic Materials Conference (MMM), BP-09, Honolulu, HI, U.S.A.　2014/11

  89. Modelling of thermally assisted magnetic recording with the LLB equation and Brillouin functions Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    59th Annual Magnetism and Magnetic Materials Conference (MMM), BP-05, Honolulu, HI, U.S.A.　2014/11

  90. Domain Wall Pinning by Antiferromagnets in Magnetic Nanowires Peer-reviewed

    Simon John Greaves

    IEEE TRANSACTIONS ON MAGNETICS　50　(11)　2014/11

    DOI： 10.1109/TMAG.2014.2320287 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  91. Shingled Thermally Assisted Magnetic Recording for 8 Tbit/in(2) Peer-reviewed

    Simon John Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　50　(11)　2014/11

    DOI： 10.1109/TMAG.2014.2318327 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  92. Model Analysis of Magnetic Write Head for Shingled Thermally Assisted Magnetic Recording Peer-reviewed

    Yasushi Kanai, Hidekazu Tamura, Kiyoshi Yamakawa, Kazuetsu Yoshida, Simon J. Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　50　(11)　2014/11

    DOI： 10.1109/TMAG.2014.2325865 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  93. Model Analysis of Tilted Spin-Torque Oscillator With Magnetic Write Head for Shingled Microwave-Assisted Magnetic Recording Peer-reviewed

    Takuto Katayama, Yasushi Kanai, Kazuetsu Yoshida, Simon J. Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　50　(11)　2014/11

    DOI： 10.1109/TMAG.2014.2325609 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  94. The dynamics of microwave assisted magnetic recording Invited Peer-reviewed

    S. Greaves, Y. Kanai, T. Katayama, H. Muraoka

    The 25th Magnetic Recording Conference (TMRC 2014), A5, Berkeley, CA, U.S.A.　2014/08

  95. Model analysis of oblique STO oscillator with magnetic write head for shingled MAMR Peer-reviewed

    T. Katayama, Y. Kanai, K. Yoshida, S. Greaves, H. Muraoka

    IEEE International Magnetics Conference (INTERMAG Europe 2014), CR-19, Dresden, Germany　2014/05

  96. Analysis of unswitched grains in thermally assisted magnetic recording

    Simon John Greaves, Hiroaki Muraoka, Yasushi Kanai

    JOURNAL OF APPLIED PHYSICS　115　(17)　2014/05

    DOI： 10.1063/1.4862223 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  97. Skew angle effects in shingled magnetic recording system with double/triple reader head array Peer-reviewed

    Moulay Rachid Elidrissi, Kheong Sann Chan, Simon Greaves, Yasushi Kanai, Hiroaki Muraoka

    JOURNAL OF APPLIED PHYSICS　115　(17)　2014/05

    DOI： 10.1063/1.4869275 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  98. Performance Evaluation of Neuro-ITI Canceller Using a Modified Writing Process for TDMR Peer-reviewed

    Masato Yamashita, Yoshihiro Okamoto, Yasuaki Nakamura, Hisashi Osawa, Simon J. Greaves, Hiroaki Muraoka

    IEICE TRANSACTIONS ON ELECTRONICS　E96C　(12)　1504-1507　2013/12

    DOI： 10.1587/transele.E96.C.1504 　

    ISSN： 1745-1353

  99. Analysis of unswitched grains in thermally assisted magnetic recording Peer-reviewed

    S. J. Greaves, H. Muraoka, Y. Kanai

    58th Annual Conference on Magnetism and Magnetic Materials (MMM), BT-03, Denver, Colorado, U.S.A.　189　2013/11

  100. Study of skew angle effects in a TDMR system Peer-reviewed

    M. R. Elidrissi, K. S. Chan, S. J. Greaves, Y. Kanai, H. Muraoka

    58th Annual Conference on Magnetism and Magnetic Materials (MMM), GW-04, Denver, Colorado, U.S.A.　708　2013/11

  101. Micromagnetic Model Analysis of Planar-Type Write Head Field Response and Dependence on Pole Tip, Return Yoke, and Shield Structure Peer-reviewed

    Yasushi Kanai, Hidekazu Tamura, Kiyoshi Yamakawa, Kazuetsu Yoshida, Simon J. Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　49　(9)　4970-4976　2013/09

    DOI： 10.1109/TMAG.2013.2251893 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  102. High Frequency Recording With Shielded Planar Type Heads Peer-reviewed

    Simon John Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　49　(7)　3806-3809　2013/07

    DOI： 10.1109/TMAG.2013.2237888 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  103. Impact of thermal gradients and media properties on thermally assisted magnetic recording

    Simon Greaves, Hiroaki Muraoka, Yasushi Kana

    映情学技報　113　(102)　2013/06/14

  104. Thermally Assisted Magnetic Recording at 4 Tbit/in(2) Peer-reviewed

    Simon John Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　49　(6)　2665-2670　2013/06

    DOI： 10.1109/TMAG.2013.2247388 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  105. Effect of growth temperature on ordering of two-dimensional square spin ice Peer-reviewed

    Simon John Greaves, Hiroaki Muraoka

    JOURNAL OF APPLIED PHYSICS　113　(17)　2013/05

    DOI： 10.1063/1.4798371 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  106. Modeling of Writing Process for Two-Dimensional Magnetic Recording and Performance Evaluation of Two-Dimensional Neural Network Equalizer Peer-reviewed

    Masato Yamashita, Yoshihiro Okamoto, Yasuaki Nakamura, Hisashi Osawa, Kenji Miura, Simon J. Greaves, Hajime Aoi, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　48　(11)　4586-4589　2012/11

    DOI： 10.1109/TMAG.2012.2194988 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  107. Micromagnetic analysis of magnetic noise in DFL read head Peer-reviewed

    A. Tanabe, Y. Kanai, K. Yoshida, S. J. Greaves, H. Muraoka

    ICAUMS2012 / 36th Conference on Magnetics in Japan，4aA-6, Nara, Japan　2012/10

  108. Planar head field responses to high-frequency write current on shield structures Peer-reviewed

    H. Tamura, Y. Kanai, K. Yoshida, K. Yamakawa, S. J. Greaves, H. Muraoka

    ICAUMS2012 / 36th Conference on Magnetics in Japan，4aA-5, Nara, Japan　2012/10

  109. Formation of thermally induced ground states in two-dimensional square spin ices Peer-reviewed

    Simon John Greaves, Hiroaki Muraoka

    JOURNAL OF APPLIED PHYSICS　112　(4)　2012/08

    DOI： 10.1063/1.4747910 　

    ISSN： 0021-8979

  110. エネルギーアシスト記録：熱補助記録とマイクロ波アシスト記録の比較 Invited

    サイモン グリーブス, 村岡裕明, 金井 靖

    IEICE Technical Report　112　(80)　25-29　2012/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    MR2012-5

  111. A comparison of HAMR and MAMR systems via micromagnetic/GFP modelling and channel simulations Peer-reviewed

    H. Wang, M. R. Elidrissi, S. S. B. Shafiee, K. Eason, K. S. Chan, S. Greaves, Y. Kanai, H. Muraoka

    IEEE International Magnetics Conference (INTERMAG 2012), HT-04, Vancouver, BC, Canada　2012/05

  112. Effect of time-dependent head fields on recording performance Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    IEEE International Magnetics Conference (INTERMAG 2012), EU-02, Vancouver, BC, Canada　2012/05

  113. Magnetization Switching in Energy Assisted Recording Peer-reviewed

    Simon Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　48　(5)　1794-1800　2012/05

    DOI： 10.1109/TMAG.2012.2187776 　

    ISSN： 0018-9464

  114. Micromagnetic Model Analysis of Planar Type Recording Write Heads for High Transfer-Rate Recording Peer-reviewed

    Yasushi Kanai, Hideto Hosokai, Kiyoshi Yamakawa, Kazuetsu Yoshida, Simon J. Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　48　(5)　1723-1730　2012/05

    DOI： 10.1109/TMAG.2011.2171927 　

    ISSN： 0018-9464

  115. High speed magnetisation reversal in heat-assisted magnetic recording Peer-reviewed

    Simon John Greaves, Hiroaki Muraoka, Yasushi Kanai

    JOURNAL OF APPLIED PHYSICS　111　(7)　2012/04

    DOI： 10.1063/1.3677679 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  116. A statistical model of write-errors in bit patterned media Peer-reviewed

    Josephat Kalezhi, Simon J. Greaves, Yasushi Kanai, Manfred E. Schabes, Michael Grobis, Jim J. Miles

    JOURNAL OF APPLIED PHYSICS　111　(5)　2012/03

    DOI： 10.1063/1.3691947 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  117. Requirements for soft magnetic underlayer (SUL)-Micromagnetic simulations of single-pole-type write heads and SUL systems Peer-reviewed

    Yasushi Kanai, Yoshihiro Jinbo, Kazuya Koyama, Kazuetsu Yoshida, Simon Greaves, Hiroaki Muraoka

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　324　(3)　282-286　2012/02

    DOI： 10.1016/j.jmmm.2010.12.016 　

    ISSN： 0304-8853

  118. Micromagnetic Simulation of Recording Write Heads a Comparison of Various Micromagnetic Software Peer-reviewed

    Toshio Tsukamoto, Yasushi Kanai, Kazuya Koyama, Kazuetsu Yoshida, Yuji Uehara, Koichi Shimizu, Simon Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　48　(2)　311-314　2012/02

    DOI： 10.1109/TMAG.2011.2172398 　

    ISSN： 0018-9464

  119. Modeling of Writing Process for Two-Dimensional Magnetic Recording and Performance Evaluation of Two-Dimensional Equalizer

    Masato YAMASHITA, Yoshihiro OKAMOTO, Yasuaki NAKAMURA, Hisashi OSAWA, Kenji MIURA, Simon GREAVES, Hajime AOI, Yasushi KANAI, Hiroaki MURAOKA

    電子情報通信学会技術研究報告 MR　111　(350)　7-14　2011/12

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    MR2011-26<br />

  120. FDM and FEM-BIM micromagnetic analysis of a single-pole-type perpendicular write head Peer-reviewed

    T. Tsukamoto, H. Hosokai, Y. Kanai, K. Yoshida, S. J. Greaves, H. Muraoka

    The 20th MAGDA Conference in Pacific Asia, 1C12, Kaohsiung, Taiwan　2011/11

  121. Micromagnetic recording field analysis of a planar type recording write head

    Hideto HOSOKAI, Yasushi KANAI, Kiyoshi YAMAKAWA, Kazuetsu YOSHIDA, Greaves Simon, Hiroaki MURAOKA

    電子情報通信学会技術研究報告 MR　111　(233)　7-12　2011/10

    Publisher:

    ISSN： 1342-6893

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    MR2011-10

  122. Split-Pole Write Head for Thermally Assisted Magnetic Recording Peer-reviewed

    Simon Greaves, Yoshihiro Jinbo, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　47　(10)　2375-2378　2011/10

    DOI： 10.1109/TMAG.2011.2146234 　

    ISSN： 0018-9464

  123. Micromagnetic Analysis to Reduce Adjacent Track Erasure Field in Planar Write Heads Peer-reviewed

    Yasushi Kanai, Hideto Hosokai, Kazuya Koyama, Kiyoshi Yamakawa, Kazuetsu Yoshida, Simon J. Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　47　(10)　3399-3402　2011/10

    DOI： 10.1109/TMAG.2011.2155631 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  124. Modelling of magnetic reversal in energy assisted recording Invited Peer-reviewed

    S. Greaves, H. Muraoka, Y. Kanai

    The 22nd Magnetic Recording Conference (TMRC 2011), E-3, Minneapolis, MN, U.S.A.　2011/08

  125. The feasibility of bit-patterned recording at 4 Tb/in.(2) without heat-assist Peer-reviewed

    Simon John Greaves, Hiroaki Muraoka, Yasushi Kanai

    JOURNAL OF APPLIED PHYSICS　109　(7)　2011/04

    DOI： 10.1063/1.3536666 　

    ISSN： 0021-8979

  126. Statistical Modeling of Write Error Rates in Bit Patterned Media for 10 Tb/in(2) Recording Peer-reviewed

    Hiroaki Muraoka, Simon John Greaves

    IEEE TRANSACTIONS ON MAGNETICS　47　(1)　26-34　2011/01

    DOI： 10.1109/TMAG.2010.2080354 　

    ISSN： 0018-9464

  127. Future Challenges in perpendicular magnetic recording for terabit recording Invited

    Hiroaki MURAOKA, Simon GREAVES

    電子情報通信学会技術研究報告 MR　110　(329)　45-50　2010/12

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

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    MR2010-48

  128. The feasibility of 4 Tb/in2 patterned media systems using conventional recording Peer-reviewed

    S. Greaves, H. Muraoka, Y. Kanai

    55th Annual Conference on Magnetism and Magnetic Materials (MMM), AR-05, Atlanta, GA, U.S.A.　55　2010/11

  129. Simulations of heat assisted recording in bit patterned media Invited

    S.J. GREAVES, H. MURAOKA, Y. KANAI

    電子情報通信学会技術研究報告 MR　110　(225)　1-6　2010/10

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    MR2010-22

  130. BER evaluation of write heads for shingled writing/two dimensional magnetic recording using the grain flipping probability model Invited Peer-reviewed

    K. S. Chan, R. M. Elidrissi, K. Eason, R. Radhakrishnan, S. J, Greaves, Y, Kanai, H. Muraoka, J. J. Miles

    The 21st Magnetic Recording Conference (TMRC 2010), D5, La Jolla, CA, U.S.A.　45-46　2010/08

  131. Micromagnetic Analysis of Shielded Write Heads Using Symmetric Multiprocessing Systems Peer-reviewed

    Yasushi Kanai, Kazuya Koyama, Manabu Ueki, Toshio Tsukamoto, Kazuetsu Yoshida, Simon John Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　46　(8)　3337-3340　2010/08

    DOI： 10.1109/TMAG.2010.2045883 　

    ISSN： 0018-9464

  132. Shingled Magnetic Recording on Bit Patterned Media Peer-reviewed

    Simon Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　46　(6)　1460-1463　2010/06

    DOI： 10.1109/TMAG.2010.2043221 　

    ISSN： 0018-9464

  133. Relationship Between Applied Field Gradient and Magnetization Switching in ECC Structured Dots Peer-reviewed

    Yuta Ikeda, Simon Greaves, Hajime Aoi, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　46　(6)　1622-1625　2010/06

    DOI： 10.1109/TMAG.2010.2041193 　

    ISSN： 0018-9464

  134. Magnetization Reversal Process of Hard/Soft Nano-Composite Structures Formed by Ion Irradiation Peer-reviewed

    M. Aniya, A. Shimada, Y. Sonobe, K. Sato, T. Shima, K. Takanashi, Simon J. Greaves, T. Ouchi, T. Homma

    IEEE TRANSACTIONS ON MAGNETICS　46　(6)　2132-2135　2010/06

    DOI： 10.1109/TMAG.2010.2043229 　

    ISSN： 0018-9464

  135. Requirements for soft magnetic underlayer (SUL) - Maxwell FEM and LLG micromagnetic simulations of single-pole-type write heads and SUL system - Invited Peer-reviewed

    Y. Kanai, H. Jinbo, K. Koyama, K. Yoshida, S. Greaves, H. Muraoka

    The Ninth Perpendicular Magnetic Recording Conference (PMRC 2010), 18pA-5, Sendai, Japan　188-189　2010/05

  136. Transition Formation in Heat-Assisted Magnetic Recording Peer-reviewed

    S. J. Greaves, T. Mizuno, H. Muraoka

    J. Magn. Soc. Jpn.　34　(2)　49-52　2010/03/01

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/msjmag.1003R002 　

    ISSN： 1882-2924

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    The effect of head field gradients and thermal gradients in heat assisted magnetic recording is investigated. When recording at a constant temperature, or in a constant external field, clear correlations between the recording performance and the head field gradient or thermal gradient can be found. Thermally assisted recording with a write head is much more complex and higher gradients do not necessarily translate into higher SNR.

  137. Finite-Element and Micromagnetic Modeling of Write Heads for Shingled Recording Peer-reviewed

    Yasushi Kanai, Yoshihiro Jinbo, Toshio Tsukamoto, Simon John Greaves, Kazuetsu Yoshida, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　46　(3)　715-721　2010/03

    DOI： 10.1109/TMAG.2009.2038354 　

    ISSN： 0018-9464

  138. High Field-Gradient Design of Single-Pole Write-Head With Planar Pole Structure Peer-reviewed

    Kiyoshi Yamakawa, Hiroaki Muraoka, Kinya Fudano, Simon John Greaves, Yuichi Ohsawa, Kazuyuki Ise, Yoshihisa Nakamura

    IEEE TRANSACTIONS ON MAGNETICS　46　(3)　730-737　2010/03

    DOI： 10.1109/TMAG.2009.2036587 　

    ISSN： 0018-9464

  139. Shingled magnetic recording in bit patterned media Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    11th Joint MMM-Intermag Conference, CY-01, Washington, DC, U.S.A.　787　2010/01

  140. Analysis of the Magnetic Properties of Discrete Track Media by the Ion Irradiation Method イオン照射型DTMにおける磁気特性解析 Peer-reviewed

    J. Yasumori, M. Aniya, A. Shimada, Y. Sonobe, S.J. Greaves, K. Miura, H. Muraoka, T. Takagi, Y. Takauchi

    J. Magn. Soc. Jpn.　33　(6-1)　429-433　2009/11/01

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/msjmag.0909RA0002 　

    ISSN： 1882-2924

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    The magnetic properties of perpendicular magnetic recording media after ion irradiation modification were studied. CGC (Coupled Granular and Continuous) PMR media with a line-and-space pattern were dosed with Ar ions at a density of 1e+16 ions/cm2. A nano-imprint technique was used to fabricate precise minute nano-scale patterns. Examination of the Kerr loop of the line-and-space pattern after ion irradiation revealed that the coercivity and nucleation field were reduced, and the loop shape was similar to the sum of the loops between the magnetic film has ion irradiated and the resist stopped ions was observed by MOKE. As expected, the interactions were quite small between the ion-irradiated area, where magnetic modification was applied, and the non-ion-irradiated area. This indicates that the exchange coupling between the track, which preserves its magnetic properties, and the groove, which is magnetically modified, was significantly smaller than that expected in the continuous layer. To evaluate the read/write characterization, a spin-stand was used. There was no abnormal head flying. It was confirmed that there was no abnormal noise, such as Barkhausen noise, in the line-and-space pattern, except at the edge of the pattern. Analysis of the readback waveform signal in FFT showed that the patterned (ion-irradiated) area has several peaks that can be observed at lower frequency than the harmonics peaks, unlike the non-patterned (non-ion-irradiated) area.

  141. Magnetic Properties of Patterned CGC Perpendicular Films With Soft Magnetic Fillings Peer-reviewed

    M. Aniya, A. Mitra, A. Shimada, Y. Sonobe, T. Ouchi, Simon J. Greaves, T. Homma

    IEEE TRANSACTIONS ON MAGNETICS　45　(10)　3539-3542　2009/10

    DOI： 10.1109/TMAG.2009.2023868 　

    ISSN： 0018-9464

  142. Servo-Pattern and Guard-Band Formation in Perpendicular Discrete-Track Media by Ion Irradiation Peer-reviewed

    Junichi Yasumori, Yoshiaki Sonobe, Simon J. Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　45　(10)　3703-3706　2009/10

    DOI： 10.1109/TMAG.2009.2023853 　

    ISSN： 0018-9464

  143. Shingled Recording for 2-3 Tbit/in(2) Peer-reviewed

    Simon Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　45　(10)　3823-3829　2009/10

    DOI： 10.1109/TMAG.2009.2021663 　

    ISSN： 0018-9464

  144. シールドを有する単磁極ヘッドのマイクロマグネティック解析 Peer-reviewed

    平澤和則, 金井靖, 吉田和悦, S. Greaves, 村岡裕明

    Journal of the Magnetics Society of Japan　33　(5)　403-413　2009/09

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/msjmag.0907RC0002 　

    ISSN： 1882-2924

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    A micromagnetic analysis of single-pole-type (SPT) heads with side and trailing shields, which are indispensable for obtaining higher values of both track and linear densities, was carried out. First, quasi-static recording field distributions were obtained for various SPT shield structures and compared with those obtained from a static finite element method (FEM) analysis. The recording fields under the main pole were in good agreement, while some discrepancies were found below the shields and the return yoke. Next, time variations of the head field and magnetization processes were obtained for a high-frequency recording current and for various shield structures. Magnetization rotation in the main pole tip, which is the origin of the dynamic recording field, was strongly affected by the magnetization in the side and trailing shields.

  145. Micromagnetic Simulations of Discrete Track Media Consisting of Soft Magnetic Fillings Peer-reviewed

    C. M. Loke, S. Greaves, H. muraoka, J. Yasumori, Y. Sonobe

    J. Magn. Soc. Jpn.　33　(3)　163-166　2009/05

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/msjmag.0903RA8090 　

    ISSN： 1882-2924

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    Discrete track media consisting of soft magnetic fillings were modelled. Using a recording head with practical dimensions, the groove permeability was varied from 1 to 100 to investigate the effect on the head field and head field gradient. As the groove permeability was increased, head fields in the groove were decreased, resulting in a significant increase in the field gradient. This phenomenon also occurred when side shields were attached to the recording head. The calculated head field distributions were used to record tracks on discrete track and granular media. Tracks recorded on media with soft magnetic fillings showed a significantly higher signal-to-noise ratio and narrower written track width than tracks recorded on a normal, granular medium.

  146. Write head modeling for shingled recording Peer-reviewed

    Y. Kanai, K. Hirasawa, Y. Jinbo, K. Yoshida, S. J. Greaves, H. Muraoka

    IEEE International Magnetics Conference (INTERMAG 2009), DC-08, Sacramento, CA, U.S.A.　2009/05

  147. Pole design optimization of shielded planar writer for 2 Tbit/in(2) recording Peer-reviewed

    Kiyoshi Yamakawa, Yuichi Ohsawa, Simon Greaves, Hiroaki Muraoka

    JOURNAL OF APPLIED PHYSICS　105　(7)　2009/04

    DOI： 10.1063/1.3074101 　

    ISSN： 0021-8979

  148. Read-write issues in ultra-high density perpendicular recording Peer-reviewed

    Simon Greaves

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　321　(6)　477-484　2009/03

    DOI： 10.1016/j.jmmm.2008.04.128 　

    ISSN： 0304-8853

  149. Approach to High-Density Recording Using CGC Structure Peer-reviewed

    Junichi Yasumori, Yoshiaki Sonobe, Simon J. Greaves, Kim Kong Tham

    IEEE TRANSACTIONS ON MAGNETICS　45　(2)　850-855　2009/02

    DOI： 10.1109/TMAG.2008.2010652 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  150. Shingled Perpendicular Magnetic Recording Technology

    Tagawa Ikuya, Greaves Simon, Muraoka Hiroaki, Kanai Yasushi

    ITE Technical Report　33　1-6　2009

    Publisher: The Institute of Image Information and Television Engineers

    DOI： 10.11485/itetr.33.50.0_1 　

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    Shingle-write is the technology to achieve higher track density without reducing head pole. Because the write-ability limit due to narrower track width is the key challenge, breakthrough against the write limit is the purpose in not only HAMR and MAMR but also BPM and Shingle-write. The concept, pros and cons on Shingle-write based on activities in the Storage Research Consortium (SRC) is discussed in this paper.

  151. 千鳥格子配置パターン媒体における記録マージンと静磁気相互作用の考察

    出川直通, Simon Greaves, 村岡裕明, 金井 靖

    電子情報通信学会技術研究報告　49-54　2008/12

    More details Close

    MR2008-45

  152. 単磁極ヘッドのFEM静磁界およびマイクロマグネティック動磁界解析

    平澤和則, 小山和也, 神保義裕, 金井 靖, 吉田和悦, Greaves Simon, 村岡裕明

    電子情報通信学会技術研究報告　32　61-66　2008/12

    Publisher: The Institute of Image Information and Television Engineers

    DOI： 10.11485/itetr.32.55.0_61 　

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    MR2008-48

  153. Simulations of RF field-assisted recording in 3 Tb/in2 patterned media Peer-reviewed

    S. Greaves, H. Muraoka, Y. Kanai

    53rd Annual Conference on Magnetism and Magnetic Materials (MMM), EC-08, Austin, TX, U.S.A.　2008/11

  154. Characterization of a 2 Tbit/in(2) Patterned Media Recording System Peer-reviewed

    Naomichi Degawa, Simon John Greaves, Hiroaki Muraoka, Yasushi Kanai

    IEEE TRANSACTIONS ON MAGNETICS　44　(11)　3434-3437　2008/11

    DOI： 10.1109/TMAG.2008.2002407 　

    ISSN： 0018-9464

  155. Magnetic Recording in Patterned Media at 5-10 Tb/in(2) Peer-reviewed

    Simon John Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　44　(11)　3430-3433　2008/11

    DOI： 10.1109/TMAG.2008.2002365 　

    ISSN： 0018-9464

  156. Micromagnetic Simulations of Cluster-Pinned Recording Media Peer-reviewed

    Cho Mun Loke, Simon John Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　44　(11)　3523-3526　2008/11

    DOI： 10.1109/TMAG.2008.2002408 　

    ISSN： 0018-9464

  157. Simulations of magnetic recording in bit patterned media Peer-reviewed

    S. J. Greaves, H. Muraoka, Y. Kanai

    The 5th Asia Forum on Magnetics, Beijing, China　2008/10/17

  158. 面記録密度2Tbits/inch2を想定したパターン媒体における記録マージンの検討

    出川直通, Simon Greaves, 村岡裕明, 金井 靖

    電子情報通信学会技術研究報告　32　7-12　2008/06

    Publisher: The Institute of Image Information and Television Engineers

    DOI： 10.11485/itetr.32.23.0_7 　

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    MR2008-2

  159. Micromagnetic Simulations of Domain Wall Pinning in Recording Media

    C.M. Loke, S. Greaves, H. Muraoka

    電子情報通信学会技術研究報告　32　47-52　2008/06

    Publisher: The Institute of Image Information and Television Engineers

    DOI： 10.11485/itetr.32.23.0_47 　

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    MR2008-9

  160. Micromagnetic recording field analysis of a single-pole-type head for 1-2 terabit/inch2 Peer-reviewed

    Y. Kanai, K. Hirasawa, T. Tsukamoto, K. Yoshida, S. J. Greaves, H. Muraoka

    IEEE International Magnetics Conference (INTERMAG 2008), HB-01, Madrid, Spain　1324　2008/05

  161. Magnetic recording in patterned media at 5-10 Tbit/in2 Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    IEEE International Magnetics Conference (INTERMAG 2008), CU-01, Madrid, Spain　504　2008/05

  162. A Study of Magnetostatic Interaction and Write Margin of Staggered Patterned Media

    DEGAWA Naomichi, Greaves Simon, MURAOKA Hiroaki, KANAI Yasushi

    ITE Technical Report　32　49-53　2008

    Publisher: The Institute of Image Information and Television Engineers

    DOI： 10.11485/itetr.32.55.0_49 　

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    The assignment of bit-patterned media (BPM) with high recording density is to reduce interference of magnetostatic interaction and adjacent track eraser (ATE). Therefore, it is effective to have the large space between adjacent dots. In this report, write margin and magnetostatic interaction of staggered bit-patterned media (BPM) with array of half bit shifted dot in down track direction were investigated and compared with square bit patterned media with regular dot array. There is no distinguished difference in both magnetostatic interactions, however, distributions of magnetostatic interaction depend on dot arrays. Staggered BPM could reduce ATE and get the larger effective margin than square BPM.

  163. Micromagnetic simulations of magnetic recording media Peer-reviewed

    Simon Greaves

    HIGH PERFORMANCE COMPUTING ON VECTOR SYSTEMS 2007　229-244　2008

    DOI： 10.1007/978-3-540-74384-2_17 　

  164. Simulation of magnetic recording for 1 Tb/in2 Invited Peer-reviewed

    S. Greaves, H. Muraoka, Y. Kanai

    The 8th Perpendicular Magnetic Recording Conference (PMRC 2007), 17pB-03, Tokyo, Japan　320-321　2007/10

  165. Optimisation of bit patterned media for 1 Tb/in2 Peer-reviewed

    N. Degawa, S. Greaves, H. Muraoka, Y. Kanai

    The 8th Perpendicular Magnetic Recording Conference (PMRC 2007), 16pE-04, Tokyo, Japan　266-267　2007/10

  166. Micromagnetic recording field analysis of a fast-switching single-pole-type head using a PC cluster system Peer-reviewed

    Y. Kanai, K. Hirasawa, T. Tsukamoto, K. Yoshida, S. Greaves, H. Muraoka

    The 8th Perpendicular Magnetic Recording Conference (PMRC 2007)，16aB-04, Tokyo, Japan　162-163　2007/10

  167. A comparative study of perpendicular media Peer-reviewed

    Simon Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　43　(6)　2118-2120　2007/06

    DOI： 10.1109/TMAG.2007.893125 　

    ISSN： 0018-9464

  168. Simulations of perpendicular recording media for 600 Gb/in2 Peer-reviewed

    S. J. Greaves, H. Muraoka, Y. Kanai

    Journal of the Magnetics Society of Japan　31　(2)　36-39　2007/02

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.31.36 　

    ISSN： 0285-0192

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    Four types of perpendicular magnetic recording media were compared using simulations to determine the most suitable candidate for use in future, high density storage products. Assuming a 75 nm track pitch, the minimum Ku values for no adjacent track erasure were determined. Roll-off curves provided an estimate of the maximum linear density. Exchange-coupled composite media appeared to be the most promising candidates, due to their high resolution and SNR and, if produced under well controlled conditions, could support areal densities of 600 Gb/in2.

  169. A comparative study of perpendicular recording media Peer-reviewed

    S. Greaves, Y. Kanai, H. Muraoka

    The 10th Joint MMM-Intermag Conference, EW-01, Baltimore, MD, U.S.A.　340　2007/01

  170. Simulations of recording in composite media Peer-reviewed

    Simon Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　42　(10)　2348-2350　2006/10

    DOI： 10.1109/TMAG.2006.878666 　

    ISSN： 0018-9464

  171. Trailing shield head recording in discrete track media Peer-reviewed

    Simon Greaves, Yasushi Kanai, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　42　(10)　2408-2410　2006/10

    DOI： 10.1109/TMAG.2006.878665 　

    ISSN： 0018-9464

  172. Simulations of perpendicular recording media for 600 Gb/in2 Invited Peer-reviewed

    S. J. Greaves, Y. Kanai, H. Muraoka

    The 3rd Asia Forum on Magnetics in Matsue, 12aC-AF1　439-440　2006/09

  173. Heat Assisted Recording Using Electron Beams Peer-reviewed

    S. J. Greaves, H. Muraoka

    日本応用磁気学会誌　30　(2007/6/2)　567-570　2006

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.30.567 　

    ISSN： 0285-0192

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    通研インポート200703

  174. Controlling the written track width in perpendicular recording media Peer-reviewed

    S. J. Greaves, Y. Kanai, H. Muraoka

    Transactions of the Magnetics Society of Japan　5　(2)　57-60　2005/05

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/tmjpn2001.5.57 　

    ISSN： 1346-7948

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    Recording simulations were used to determine the factors which influence the recorded track width in perpendicular media. Reducing the width of the main pole and adding side shields to the head are effective methods to write narrower tracks, whilst trailing shields can increase the SNR. Exchange coupling in the recording layer increases the track width, but erase bands are narrowed. However, the magnetisation of a pre-recorded track can influence the switching of grains at the edges of adjacent tracks if the exchange coupling strength is large.

  175. Track edge effects in perpendicular recording media Peer-reviewed

    S. J. Greaves, Y. Kanai, H. Muraoka

    The First Asia Forum, 23pB-2, Ginowan, Japan　2004/09

  176. FEM model analysis of SPT head for 400 Gbpsi recording Peer-reviewed

    Y. Kanai, S. J. Greaves, K. Yamakawa, H. Aoi, H. Muraoka, Y. Nakamura

    The First Asia Forum, 23pB-1, Ginowan, Japan　2004/09

  177. A SPT head design for 400 Gbpsi recording Invited Peer-reviewed

    Y. Kanai, S. J. Greaves, K. Yamakawa, H. Aoi, H. Muraoka, Y. Nakamura

    3rd North American Perpendicular Magnetic Recording Conference (NAPMRC 2004), Boulder, CO, U.S.A.　2004/08/10

  178. Effect of Exchange Interaction on Written Bit Stability in Perpendicular Media Peer-reviewed

    S.J. Greaves, H. Muraoka, Y. Sugita, Y. Nakamura

    J. Magn Soc. Jpn　23　(4-2)　993-996　1999

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.23.993 　

    ISSN： 0285-0192

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    We discuss the effect of exchange coupling on written bit stability in perpendicular media in terms of resistance to thermal fluctuations. The optimum value of exchange coupling appears to coincide with a medium in which overall interactions, as measured by the δM curve, are close to zero. We calculate the upper limit of the areal density that can be supported by our typical medium and find values of between 80 and 400 Gb/in2, depending on the bit aspect ratio.

  179. Interlayer Coupling and Size Effects in Spin-Valve Flim Peer-reviewed

    S.J. Greaves, H. Muraoka, Y. Sugita, Y. Nakamura

    J. Magn. Soc. Jpn.　22　(4-2)　517-520　1998

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.22.517 　

    ISSN： 0285-0192

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    Interlayer coupling in spin-valve structures has been incorporated into a micromagnetic model by means of an exchange-coupling-type term. Magnetoresistance ratios were calculated by using an electron-scattering probability model, and good agreement with experimental results was found. The problems posed by demagnetising fields in small spin-valve elements were also considered.

  180. Deposition and modeling of spin valve structures Peer-reviewed

    S. J. GREAVES, H. MURAOKA, Y. NAKAMURA

    J. Magn. Soc. Japan　21　(supple.S2)　383-386　1997

  181. Interaction effects and magnetic ordering in GMR alloys

    S. J. Greaves, M. El-Hilo, K. O'Grady, M. Watson

    Journal of Applied Physics　76　6802-6804　1994/12/01

    DOI： 10.1063/1.358472 　

    ISSN： 0021-8979

  182. Minor hysteresis loop effects in magnetic materials

    K. O'Grady, S. J. Greaves

    Journal of Magnetism and Magnetic Materials　138　1994/01/01

    DOI： 10.1016/0304-8853(94)90043-4 　

    ISSN： 0304-8853

  183. MICRO-ANNEALING STUDIES OF PT/CO MULTILAYERS FOR MAGNETOOPTIC RECORDING APPLICATIONS Peer-reviewed

    CD WRIGHT, WW CLEGG, A BOUDJEMLINE, NAE HEYES, PJ GRUNDY, RJ POLLARD, SJ GREAVES, AK PETFORDLONG, YH KIM, JP JAKUBOVICS

    IEEE TRANSACTIONS ON MAGNETICS　28　(5)　2671-2673　1992/09

    ISSN： 0018-9464

  184. A MAGNETIC AND HIGH-RESOLUTION STRUCTURAL INVESTIGATION OF PT/CO MULTILAYERS

    SJ GREAVES, AK PETFORDLONG, YH KIM, RJ POLLARD, PJ GRUNDY, JP JAKUBOVICS

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　113　(1-3)　63-71　1992/07

    DOI： 10.1016/0304-8853(92)91247-Q 　

    ISSN： 0304-8853

Show all ︎Show first 5

Misc. 107

  1. A study on 3B-2T code for double-layered magnetic recording

    仲村泰明, 西川まどか, GREAVES Simon, 金井靖, 岡本好弘

    電子情報通信学会大会講演論文集(CD-ROM)　2025　2025

    ISSN： 1349-144X

  2. A study on recording condition evaluation for multilayer magnetic recording using HAMR

    渡部智也, 仲村泰明, 西川まどか, GREAVES Simon, 岡本好弘

    電子情報通信学会技術研究報告(Web)　124　(67(MRIS2024 1-7))　2024

    ISSN： 2432-6380

  3. A Study of HAMR R/W Channels for Multilayer Magnetic Recording

    仲村泰明, 西川まどか, GREAVES Simon J., 金井靖, 岡本好弘

    電子情報通信学会技術研究報告(Web)　123　(295(MRIS2023 22-29))　2023

    ISSN： 2432-6380

  4. A perspective on deep neural network-based detection for multilayer magnetic recording

    Ahmed Aboutaleb, Amirhossein Sayyafan, Krishnamoorthy Sivakumar, Benjamin Belzer, Simon Greaves, Kheong Sann Chan, Roger Wood

    Applied Physics Letters　119　(1)　2021/07/05

    DOI： 10.1063/5.0051085 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  5. Media optimization for 3d microwave-assisted magnetic recording via response surface methodology

    Kheong Sann Chan, Simon Greaves, Susanto Rahardja

    2018 Asia-Pacific Magnetic Recording Conference, APMRC 2018　2019/01/03

    DOI： 10.1109/APMRC.2018.8601114 　

  6. Micromagnetic model analysis of spin-torque oscillator (STO) integrated into recording write head for microwave-assisted magnetic recording-oscillation of STO vs. rise time of in-gap field-

    Y. Kanai, R. Itagaki, S. Greaves, H. Muraoka

    2018 IEEE International Magnetic Conference, INTERMAG 2018　2018/10/24

    DOI： 10.1109/INTMAG.2018.8508817 　

  7. Micromagnetic analysis of MAMR recording head : Oscillation of small-sized STO with small external field

    117　(247)　17-22　2017/10/19

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  8. A comparison of single phase and antiferromagnetically coupled media for microwave assisted magnetic recording (磁気記録・情報ストレージ)

    グリーブス サイモン, 金井 靖, 村岡 裕明

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　117　(247)　29-34　2017/10/19

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  9. Micromagnetic analysis of MAMR recording head : Oscillation of small-sized STO with small external field

    41　(34)　17-22　2017/10

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  10. A comparison of single phase and antiferromagnetically coupled media for microwave assisted magnetic recording (マルチメディアストレージ)

    グリーブス サイモン, 金井 靖, 村岡 裕明

    映像情報メディア学会技術報告 = ITE technical report　41　(34)　29-34　2017/10

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  11. Micromagnetic model analysis of various spin torque oscillators with write head for microwave-assisted magnetic recording

    Y. Kanai, R. Itagaki, S. Greaves, H. Muraoka

    2017 IEEE International Magnetics Conference, INTERMAG 2017　2017/08/10

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/INTMAG.2017.8007581 　

  12. Optimising composite media for heat assisted magnetic recording

    S. Greaves, H. Muraoka, Y. Sonobe

    2017 IEEE International Magnetics Conference, INTERMAG 2017　2017/08/10

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/INTMAG.2017.8007580 　

  13. Magnetisation switching of ECC grains in microwave-assisted magnetic recording (磁気記録・情報ストレージ)

    グリーブス サイモン, 金井 靖, 村岡 裕明

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報　117　(80)　65-70　2017/06/08

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  14. Micromagnetic Model Analysis of STO and Recording Head for Microwave-Assisted Magnetic Recording : Various Types of STO and Write Head

    117　(80)　59-64　2017/06/08

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  15. Magnetisation switching of ECC grains in microwave-assisted magnetic recording (マルチメディアストレージ)

    グリーブス サイモン, 金井 靖, 村岡 裕明

    映像情報メディア学会技術報告 = ITE technical report　41　(17)　65-70　2017/06

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  16. Micromagnetic Model Analysis of STO and Recording Head for Microwave-Assisted Magnetic Recording : Various Types of STO and Write Head

    41　(17)　59-64　2017/06

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  17. Simulation of STO for microwave-assisted magnetic recording(3)Optimum injected current of integrated STO

    116　(83)　67-72　2016/06/09

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  18. Micromagnetic simulation of STO for microwave-assisted magnetic recording(4)Optimum injected current density of integrated STO vs. write head structure and head material characteristics

    116　(83)　73-78　2016/06/09

    Publisher: 電子情報通信学会

    ISSN： 0913-5685

  19. Micromagnetic simulations of magnetization reversal time

    40　(16)　21-25　2016/06

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  20. Simulation of STO for microwave-assisted magnetic recording(3)Optimum injected current of integrated STO

    40　(16)　67-72　2016/06

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  21. Micromagnetic simulation of STO for microwave-assisted magnetic recording(4)Optimum injected current density of integrated STO vs. write head structure and head material characteristics

    40　(16)　73-78　2016/06

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  22. C-7-3 Sample modeling of readback response based on granular micro structure

    Jin Takuma, Muraoka Hiroaki, Greaves Simon

    Proceedings of the IEICE General Conference　2015　(2)　21-21　2015/02/24

    Publisher: The Institute of Electronics, Information and Communication Engineers

  23. Microwave-assisted shingled magnetic recording.

    S. Greaves, Y. Kanai, H. Muraoka

    2015 IEEE MAGNETICS CONFERENCE (INTERMAG)　2015

  24. Areal Density prediction for Microwave Assisted Magnetic Recording (MAMR).

    K. K. Teo, K. Chan, S. Greaves, Y. Kanai

    2015 IEEE MAGNETICS CONFERENCE (INTERMAG)　2015

    DOI： 10.1109/INTMAG.2015.7157141 　

  25. Areal Density prediction for Microwave Assisted Magnetic Recording (MAMR).

    K. K. Teo, K. Chan, S. Greaves, Y. Kanai

    2015 IEEE MAGNETICS CONFERENCE (INTERMAG)　2015

    DOI： 10.1109/INTMAG.2015.7157036 　

  26. Analytical expressions for transition width and transition jitter in granular PMR media taking account of switching field distribution

    T. Jin, H. Muraoka, S. Greaves

    2015 IEEE MAGNETICS CONFERENCE (INTERMAG)　2015

    DOI： 10.1109/INTMAG.2015.7157321 　

  27. Simple modeling of readback response based on granular micro-structure

    JIN Takuma, MURAOKA Hiroaki, Greaves Simon

    IEICE technical report. Magnetic recording　114　(355)　35-39　2014/12/11

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Magnetization transitions, readback waveforms, and transition jitter are formulated for Voronoi modeling using error functions. Suitable coefficients for the error functions are provided by the parameters of the granular media, i.e., average grain diameter and grain size distribution. TEM images of real media are used to confirm the fitted results. Random grain positions and uniform SFD are assumed. Readback waveforms for isolated transitions are calculated by reciprocity. The pulse width, T_<50>, is formulated from the medium parameters and readback conditions. An error function with the same T_<50> and slope at the transition center is a good fit. An analytical expression for jitter noise is presented comprising grain size and track width parameters

  28. Simple modeling of readback response based on granular micro-structure

    38　(50)　35-39　2014/12

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  29. Simulation of spin-torque oscillator for microwave-assisted magnetic recording

    KATAYAMA Takuto, KANAI Yasushi, YOSHIDA Kazuetsu, GREAVES Simon, MURAOKA Hiroaki

    IEICE technical report. Magnetic recording　114　(234)　33-38　2014/09/25

    Publisher: The Institute of Electronics, Information and Communication Engineers

    More details Close

    The spin-torque oscillator (STO) is the most important component in microwave-assisted magnetic recording (MAMR). Some requirements for the STO are: large amplitude and stable oscillation, small injected current and oscillation at a frequency that excites resonance in a recording medium. It is also necessary for the STO oscillation to closely follow the head coil current. In this paper, STOs were integrated into write heads and micromagnetic analyses carried out to obtain a write head structure with stable STO oscillation that could follow a high frequency head coil current. STO materials were also investigated for small injected currents.

  30. CS-3-4 A Study on Modeling of Writing Process Based on Stoner-Wohlfarth Reversal Mechanism andNeuro-III Canceller for Two-Dimensional Magnetic Recording

    Yamashita M., Okamoto Y., Nakamura Y., Ohsawa H., S. Greaves, むらおか H.

    Proceedings of the IEICE General Conference　2013　(2)　"S-12"-"S-13"　2013/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  31. Optimal design of MAMR and HAMR by applying response surface methodology

    H. T. Wang, M. R. Elidrissi, K. S. Chan, K. Eason, B. X. Xu, S. J. Greaves, Y. Kanai, H. Muraoka

    IEEE Transactions on Magnetics　49　(6)　2719-2722　2013

    DOI： 10.1109/TMAG.2013.2257704 　

    ISSN： 0018-9464

  32. Energy Assisted Recording : Comparing HAMR and MAMR (マルチメディアストレージ)

    グリーブス サイモン, 村岡 裕明, 金井 靖

    映像情報メディア学会技術報告　36　(22)　25-29　2012/06

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  33. A study on modeling of the writing process and two-dimensional neural network equalization for two-dimensional magnetic recording

    Masato Yamashita, Yoshihiro Okamoto, Yasuaki Nakamura, Hisashi Osawa, Kenji Miura, S. Greaves, H. Aoi, Y. Kanai, Hiroaki Muraoka

    JOURNAL OF APPLIED PHYSICS　111　(7)　2012/04

    DOI： 10.1063/1.3680535 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  34. CS-4-2 A Study on Modeling of Writing Process Considering Interaction Fields and Two-Dimensional Neural Network Equalization for Two-Dimensional Magnetic Recording

    Yamashita M., Okamoto Y., Nakamura Y., Osawa H., Miura K., Greaves S., Aoi H., Kanai Y., Muraoka H.

    Proceedings of the IEICE General Conference　2012　(2)　"S-9"　2012/03/06

    Publisher: The Institute of Electronics, Information and Communication Engineers

  35. The potential of bit patterned media in shingled recording

    S. J. Greaves, H. Muraoka, Y. Kanai

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　324　(3)　314-320　2012/02

    DOI： 10.1016/j.jmmm.2010.12.017 　

    ISSN： 0304-8853

  36. Heat Assisted Recording at 4 Tbit/in(2)

    S. J. Greaves, Y. Kanai, H. Muraoka

    2012 DIGEST ASIA-PACIFIC MAGNETIC RECORDING CONFERENCE (APMRC)　2012

  37. C-7-4 A Study on Modeling of Writing Process and Two-Dimensional Equalization for TDMR

    Yamashita M., Okamoto Y., Nakamura Y., Osawa H., Miura K., Greaves S., Aoi H., Kanai Y., Muraoka H.

    Proceedings of the Society Conference of IEICE　2011　(2)　27-27　2011/08/30

    Publisher: The Institute of Electronics, Information and Communication Engineers

  38. Simulations of heat assisted recording in bit patterned media (マルチメディアストレージ)

    Greaves Simon, 村岡 裕明, 金井 靖

    映像情報メディア学会技術報告　34　(39)　1-6　2010/10

    Publisher: 映像情報メディア学会

    ISSN： 1342-6893

  39. Application of Micromagnetics to Magnetic Recording VII : Application to Microwave Assisted Magnetic Recording

    GREAVES S. J., YOSHIDA K., KANAI Y., TAKAGISHI M., AKAGI F.

    5　(9)　422-429　2010/09/01

    ISSN： 1880-7208

  40. Application of Micromagnetics to Magnetic Recording VI : FApplication to Thermally Assisted Magnetic Recording

    AKAGI F., GREAVES S., YOSHIDA K., KANAI Y., TAKAGISHI M.

    Magnetics Japan　5　(7)　348-355　2010/07/01

    Publisher: 日本磁気学会

    ISSN： 1880-7208

  41. Shingled Perpendicular Magnetic Recording and Suitable Write Heads

    Y. Kanai, S. Greaves, H. Muraoka, I. Tagawa

    Magnetics Jpn.　5　(7)　320-331　2010/07

    Publisher: The Magnetics Society of Jpan

    ISSN： 1880-7208

  42. Applications on Micromagnetics to Magnetic Recording V : Various Models for Read-Back Simulations Using Micromagnetics

    TAKAGISHI M., YOSHIDA K., GREAVES S. J., KANAI Y., AKAGI F.

    Magnetics Japan　5　(4)　191-200　2010/04/01

    Publisher: 日本磁気学会

    ISSN： 1880-7208

  43. Application of Micromagnetics to Magnetic Recording IV : Recording Field and Magnetization Analysis of Recording Write Heads (2)

    KANAI Y., YOSHIDA K., GREAVES S., TAKAGISHI M., AKAGI F.

    Magnetics Japan　5　(1)　30-38　2010/01/01

    Publisher: 社団法人日本磁気学会

    ISSN： 1880-7208

  44. IEEE Trans. Magn

    Kiyoshi Yamakawa, Hiroaki Muraoka, Kinya Fudano, Simon John Greaves, Yuichi Ohsawa, Kazuyuki Ise, Yoshihisa Nakamura

    High Field-Gradient Design of Single-Pole Write-Head With Planar Pole Structure　46　(3)　730-737　2010

    DOI： 10.1109/TMAG.2009.2036587 　

  45. Applications of Micromagnetics to Magnetic Recording II : Advanced Magnetic Recording Media Model

    GREAVES S. J., YOSHIDA K., KANAI Y., TAKAGISHI M., AKAGI F.

    Magnetics Japan　4　(7)　358-365　2009/07

    Publisher: 日本磁気学会

    ISSN： 1880-7208

  46. Application of Micromagnetics to Magnetic Recording I : Outline of Magnetic Recording Simulators Using Micromagnetics

    YOSHIDA K., KANAI Y., GREAVES Simon, TAKAGISHI M., AKAGI F.

    Magnetics Japan　4　(4)　197-205　2009/04/01

    Publisher: 日本磁気学会

    ISSN： 1880-7208

  47. Micromagnetic recording field analysis of a fast-switching single-pole-type head

    Y. Kanai, K. Hirasawa, T. Tsukamoto, K. Yoshida, S. Greaves, H. Muraoka

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　320　(22)　2971-2974　2008/11

    DOI： 10.1016/j.jmmm.2008.08.086 　

    ISSN： 0304-8853

  48. Optimisation of bit patterned media for 1 Tb/in(2)

    N. Degawa, S. J. Greaves, H. Muraoka, Y. Kanai

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　320　(22)　3092-3095　2008/11

    DOI： 10.1016/j.jmmm.2008.08.097 　

    ISSN： 0304-8853

  49. Simulations of continuous/cluster-pinned recording media

    C. M. Loke, S. J. Greaves, H. Muraoka

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　320　(22)　2944-2947　2008/11

    DOI： 10.1016/j.jmmm.2008.08.064 　

    ISSN： 0304-8853

  50. Simulations of recording media for 1 Tb/in(2)

    S. J. Greaves, H. Muraoka, Y. Kanai

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　320　(22)　2889-2893　2008/11

    DOI： 10.1016/j.jmmm.2008.08.094 　

    ISSN： 0304-8853

  51. Micromagnetic Recording Field Analysis of a Single-Pole-Type Head for 1-2 Tbit/in(2)

    Yasushi Kanai, Kazunori Hirasawa, Toshio Tsukamoto, Kazuetsu Yoshida, Sinion John Greaves, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　44　(11)　3609-3612　2008/11

    DOI： 10.1109/TMAG.2008.2002409 　

    ISSN： 0018-9464

  52. Modeling and simulation of the writing process on bit-patterned perpendicular media

    Hiroaki Muraoka, Simon J. Greaves, Yasushi Kanai

    IEEE Transactions on Magnetics　44　(11)　2423-2429　2008/11

    DOI： 10.1109/TMAG.2008.2001654 　

    ISSN： 0018-9464

  53. Anisotropy dispersion in (CoCrPt)(1-x)(SiO(2))(x) perpendicular recording media

    A. Carter, L. E. Fernandez-Outon, Y. Inaba, S. J. Greaves, H. Muraoka, K. O&apos;Grady

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　320　(18)　2269-2272　2008/09

    DOI： 10.1016/j.jmmm.2008.04.126 　

    ISSN： 0304-8853

  54. Micromagnetic recording field analysis of fast-switching single-pole-type heads for bit-patterned media

    Y. Kanai, M. Saiki, K. Hirasawa, T. Tsukamoto, K. Yoshida, S. J. Greaves, H. Muraoka

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　320　(14)　E287-E290　2008/07

    DOI： 10.1016/j.jmmm.2008.02.120 　

    ISSN： 0304-8853

  55. C-7-4 A study of read-write characteristics of 2 Tbit/in^2 patterned media

    Degawa Naomichi, Greaves Simon, Muraoka Hiroaki, Kanai Yasushi

    Proceedings of the IEICE General Conference　2008　(2)　35-35　2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  56. C-7-2 Micromagnetic Simulations of Cluster-pinned Recording Media

    Loke C.M., Greaves S., Muraoka H.

    Proceedings of the IEICE General Conference　2008　(2)　33-33　2008/03/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

  57. Simulations of magnetic recording media for areal densities of 1Tb/in^2

    GREAVES S. J., MURAOKA H., KANAI Y.

    IEICE technical report　107　(136)　19-24　2007/07/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN： 0913-5685

    More details Close

    Simulations of recording in perpendicular media were carried out to determine the optimum parameters for supporting an areal density of 1 Tb/in^2. Single layer and exchange-coupled composite (ECC) media [1] were considered. Magnetic properties of the hard and soft phases were optimised for thermal stability and signal to noise ratio (SNR). The ECC media had 50% higher energy barriers than single layer media with the same SNR and could operate at a track pitch of 68 nm, compared with 80 nm for the single layer media. Areal densities of around 900 Gb/in^2 appear feasible using such media.

  58. Effect of the temperature dependence of H-k in thermally assisted recording

    S. J. Greaves, H. Muraoka

    JOURNAL OF APPLIED PHYSICS　101　(9)　2007/05

    DOI： 10.1063/1.2710543 　

    ISSN： 0021-8979

  59. Magnetic and recording properties of (CoCrPt)(1-x)(SiO2)(x) media

    J. D. Dutson, M. Hashimoto, Y. Inaba, S. J. Greaves, H. Muraoka, K. O'Grady

    IEEE TRANSACTIONS ON MAGNETICS　43　(2)　814-818　2007/02

    DOI： 10.1109/TMAG.2006.888437 　

    ISSN： 0018-9464

  60. Micromagnetic simulations of discrete track media

    S. J. Greaves, Y. Kanai, H. Muraoka

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　303　(2)　E1-E5　2006/08

    DOI： 10.1016/j.jmmm.2006.01.170 　

    ISSN： 0304-8853

  61. Discrete track media for 600 Gbits/in(2) recording

    SJ Greaves, H Muraoka, Y Kanai

    JOURNAL OF APPLIED PHYSICS　99　(8)　2006/04

    DOI： 10.1063/1.2170071 　

    ISSN： 0021-8979

  62. Simulations of recording in composite media

    S. Greaves, H. Muraoka

    INTERMAG 2006 - IEEE International Magnetics Conference　252　2006

    DOI： 10.1109/INTMAG.2006.375834 　

  63. Trailing shield head recording in discrete track media

    S. Greaves, H. Muraoka, Y. Kanai

    INTERMAG 2006 - IEEE International Magnetics Conference　482　2006

    DOI： 10.1109/INTMAG.2006.376206 　

  64. The effect of write head structures on written transitions in perpendicular media

    S. J. Greaves, H. Muraoka, Y. Kanai

    INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference　245　2005/12/12

  65. Fluctuation fields in perpendicular media

    S. J. Greaves, H. Muraoka

    INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference　304　2005/12/12

  66. Fluctuation fields in perpendicular media

    S Greaves, H Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　41　(10)　3124-3126　2005/10

    DOI： 10.1109/TMAG.2005.854844 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  67. The effect of write head structures on written transitions in perpendicular media

    S Greaves, Y Kanai, H Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　41　(10)　3058-3060　2005/10

    DOI： 10.1109/TMAG.2005.855226 　

    ISSN： 0018-9464

  68. Recording Field Analysis of Single-Pole-Type Head

    KANAI Yasushi, GREAVES Simon J., YOSHIDA Kazuetsu, YAMAKAWA Kiyoshi, AOI Hajime, MURAOKA Hiroaki, NAKAMURA Yoshihisa

    139　17-24　2005/02/01

    ISSN： 1340-7562

  69. Exchange coupling and grain-size distributions in perpendicular recording media

    SJ Greaves, AM Goodman, H Muraoka, Y Nakamura

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　287　66-71　2005/02

    DOI： 10.1016/j.jmmm.2004.10.009 　

    ISSN： 0304-8853

  70. Simulations of perpendicular media for 400 Gb/in(2)

    SJ Greaves, Y Kanai, H Muraoka

    IEEE TRANSACTIONS ON MAGNETICS　41　(2)　713-718　2005/02

    DOI： 10.1109/TMAG.2004.839068 　

    ISSN： 0018-9464

  71. A single-pole-type head design for 400 Gb/in(2) recording

    Y Kanai, SJ Greaves, K Yamakawa, H Aoi, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS　41　(2)　687-695　2005/02

    DOI： 10.1109/TMAG.2004.839073 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  72. Micromagnetics of hysteresis loops in CGC perpendicular media

    AM Goodman, SJ Greaves, H Muraoka, K Miura, Y Sonobe, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS　39　(5)　2329-2331　2003/09

    DOI： 10.1109/TMAG.2003.816287 　

    ISSN： 0018-9464

  73. Effect of intergranular exchange coupling on transition irregularity in coupled granular/continuous perpendicular media

    AM Goodman, H Muraoka, SJ Greaves, K Muira, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS　39　(2)　685-690　2003/03

    DOI： 10.1109/TMAG.2003.808994 　

    ISSN： 0018-9464

  74. Micromagnetics of hysteresis loops in CGC perpendicular media

    A. M. Goodman, S. J. Greaves, H. Muraoka, Y. Sonobe, Y. Nakamura

    Intermag 2003 - Program of the 2003 IEEE International Magnetics Conference　2003

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/INTMAG.2003.1230487 　

  75. Micromagnetics of hysteresis loops in CGC perpendicular media

    A. M. Goodman, S. J. Greaves, H. Muraoka, Y. Sonobe, Y. Nakamura

    Intermag 2003 - Program of the 2003 IEEE International Magnetics Conference　2003

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/INTMAG.2003.1230487 　

    ISSN： 0074-6843

  76. Simulations of magnetic recording in coupled granular/continuous perpendicular media with random pinning sites

    AA Goodman, SJ Greaves, Y Sonobe, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS　38　(5)　2051-2053　2002/09

    DOI： 10.1109/TMAG.2002.801831 　

    ISSN： 0018-9464

  77. Smoothing of bit transition irregularity in coupled granular/continuous perpendicular media

    AM Goodman, SJ Greaves, Y Sonobe, H Muraoka, Y Nakamura

    JOURNAL OF APPLIED PHYSICS　91　(10)　8064-8066　2002/05

    DOI： 10.1063/1.1447483 　

    ISSN： 0021-8979

  78. Simulation of magnetic recording in media with irregular microstructures

    SJ Greaves, M Miura, AM Goodman

    JOURNAL OF APPLIED PHYSICS　91　(10)　8284-8286　2002/05

    DOI： 10.1063/1.1447535 　

    ISSN： 0021-8979

  79. Micromagnetic simulations of antiferromagnetically coupled media

    SJ Greaves, KK Tham, M Miura, AM Goodman

    JOURNAL OF APPLIED PHYSICS　91　(10)　8281-8283　2002/05

    DOI： 10.1063/1.1447534 　

    ISSN： 0021-8979

  80. Simulations of magnetic recording in CGC perpendicular media with random pinning sites

    A. M. Goodman, S. J. Greaves, Y. Sonobe, H. Muraoka, Y. Nakamura

    INTERMAG Europe 2002 - IEEE International Magnetics Conference　2002

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/INTMAG.2002.1001162 　

  81. Optimisation of exchange coupling in perpendicular media

    S. J. Greaves, M. Miura

    INTERMAG Europe 2002 - IEEE International Magnetics Conference　2002

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/INTMAG.2002.1001019 　

  82. Simulations of magnetic recording in CGC perpendicular media with random pinning sites

    A. M. Goodman, S. J. Greaves, Y. Sonobe, H. Muraoka, Y. Nakamura

    INTERMAG Europe 2002 - IEEE International Magnetics Conference　2002

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/INTMAG.2002.1001162 　

    ISSN： 0074-6843

  83. Optimisation of exchange coupling in perpendicular media

    S. J. Greaves, M. Miura

    INTERMAG Europe 2002 - IEEE International Magnetics Conference　2002

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI： 10.1109/INTMAG.2002.1001019 　

    ISSN： 0074-6843

  84. Pinning of written bits in perpendicular recording media

    SJ Greaves, H Muraoka, Y Sonobe, M Schabes, Y Nakamura

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　235　(1-3)　418-423　2001/10

    DOI： 10.1016/S0304-8853(01)00400-0 　

    ISSN： 0304-8853

  85. Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media (vol 36, pg 2375, 2000)

    T Shimatsu, SJ Greaves, K Muramatsu, Watanabe, I, H Muraoka, Y Sugita, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS　37　(4)　3081-3081　2001/07

    ISSN： 0018-9464

  86. Erratum: Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media (IEEE Transactions on Magnetics (Sept. 2000) 36 (2375-2377))

    T. Shimatsu, S. J. Greaves, K. Muramatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    IEEE Transactions on Magnetics　37　3081　2001/07/01

    DOI： 10.1109/TMAG.2001.947073 　

    ISSN： 0018-9464

  87. Thermal stability and SNR of coupled granular/continuous media

    Y Sonobe, D Weller, Y Ikeda, M Schabes, K Takano, G Zeltzer, BK Yen, ME Best, SJ Greaves, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS　37　(4)　1667-1670　2001/07

    DOI： 10.1109/20.950932 　

    ISSN： 0018-9464

  88. Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media

    T Shimatsu, SJ Greaves, K Muramatsu, Watanabe, I, H Muraoka, Y Sugita, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS　36　(5)　2375-2377　2000/09

    DOI： 10.1109/20.908435 　

    ISSN： 0018-9464

  89. High frequency effects in perpendicular recording media

    SJ Greaves, H Muraoka, Y Sugita, Y Nakamura

    JOURNAL OF APPLIED PHYSICS　87　(9)　4990-4992　2000/05

    ISSN： 0021-8979

  90. High-Frequency Effects in Perpendicular Recording Media

    S. J. Greaves, H. Muraoka, Y. Sugita, Y. Nakamura

    J.Magn.Soc.Japan　24　(4-2)　255-258　2000

    DOI： 10.3379/jmsjmag.24.255 　

    ISSN： 0285-0192 1880-4004

  91. Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media

    T. Shimatsu, S. J. Greaves, K. Muramatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    Digests of the Intermag Conference　2000/01/01

    ISSN： 0074-6843

  92. Domain wall pinning in perpendicular recording media

    S. J. Greaves, H. Muraoka, Y. Sugita, Y. Nakamura

    Digests of the Intermag Conference　1999/12/01

    ISSN： 0074-6843

  93. Thermal bit-writing dynamics in magneto-optic recording media

    S. J. Greaves, H. Muraoka, Y. Sugita, Y. Nakamura

    Digests of the Intermag Conference　1999/12/01

    ISSN： 0074-6843

  94. Simulations of time dependence in perpendicular media

    S. J. Greaves, H. Muraoka, Y. Sugita, Y. Nakamura

    Journal of Magnetism and Magnetic Materials　193　(1-3)　409-411　1999

    Publisher: Elsevier

    DOI： 10.1016/S0304-8853(98)00463-6 　

    ISSN： 0304-8853

  95. Intergranular exchange pinning effects in perpendicular recording media

    S. J. Greaves, H. Muraoka, Y. Sugita, Y. Nakamura

    IEEE Transactions on Magnetics　35　(5)　3772-3774　1999

    DOI： 10.1109/20.800660 　

    ISSN： 0018-9464

  96. Thermal bit writing simulations in magneto-optic recording media

    S. J. Greaves, H. Muraoka, Y. Sugita, Y. Nakamura

    IEEE Transactions on Magnetics　35　(5)　3859-3861　1999

    DOI： 10.1109/20.800688 　

    ISSN： 0018-9464

  97. THERMAL RELAXATION OF PERPENDICULAR DOUBLE LAYER MEDIA

    MURAOKA H., JIANG W. H., GREAVES S. J., SUGITA Y., NAKAMURA Y.

    103　37-44　1998/01/29

    ISSN： 1340-7562

  98. Pulse and low temperature magnetometry of y-fe<inf>2</inf>o<inf>3</inf> dispersions

    S. J. Greaves, C. P. Hancock, K. O'Grady

    IEEE Transactions on Magnetics　32　4040-4042　1996/12/01

    DOI： 10.1109/20.539256 　

    ISSN： 0018-9464

  99. Interaction effects in barium ferrite dispersions using low temperature magnetometry

    S. J. Greaves

    IEEE Transactions on Magnetics　32　4046-4048　1996/12/01

    DOI： 10.1109/20.539258 　

    ISSN： 0018-9464

  100. Characterisation of magnetic pigment dispersions using pulsed magnetic fields

    C. P. Hancock, S. J. Greaves, K. O'Grady, R. G. Williams, A. R. Owens

    IEEE Transactions on Magnetics　32　4037-4039　1996/12/01

    DOI： 10.1109/20.539255 　

    ISSN： 0018-9464

  101. Exchange anisotropy effects in NiFe layers and NiFe/Cr multilayers

    K. O'Grady, S. J. Greaves, S. M. Thompson

    Journal of Magnetism and Magnetic Materials　156　253-254　1996/01/01

    DOI： 10.1016/0304-8853(95)00856-X 　

    ISSN： 0304-8853

  102. Determination of pigment dispersion microstructure by magnetic measurements

    S. J. Greaves, K. O'Grady

    Journal of Magnetism and Magnetic Materials　155　120-122　1996/01/01

    DOI： 10.1016/0304-8853(95)00673-7 　

    ISSN： 0304-8853

  103. Anomalous Effects in Minor Hysteresis Loops

    K. O'Grady, S. J. Greaves

    IEEE Transactions on Magnetics　31　2794-2796　1995/01/01

    DOI： 10.1109/20.490154 　

    ISSN： 0018-9464

  104. Time Dependence of GMR in Granular Alloys

    S. J. Greaves, K. O'Grady, M. L. Watson, R. W. Chantrell

    IEEE Transactions on Magnetics　31　3961-3963　1995/01/01

    DOI： 10.1109/20.489830 　

    ISSN： 0018-9464

  105. Reversal mechanisms in Tb/Fe multilayers

    K. O'Grady, T. Thomson, S. J. Greaves, G. Bayreuther

    Journal of Applied Physics　75　6849-6851　1994/12/01

    DOI： 10.1063/1.356805 　

    ISSN： 0021-8979

  106. THE MAGNETIC-STRUCTURE OF PLATINUM COBALT MULTILAYERS

    RT HEAP, SJ GREAVES

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　27　(7)　1343-1347　1994/07

    DOI： 10.1088/0022-3727/27/7/001 　

    ISSN： 0022-3727

  107. MAGNETIC-PROPERTIES OF COBALT LAYERS AND CO/PT MULTILAYERS

    SJ GREAVES, PJ GRUNDY, RJ POLLARD

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　121　(1-3)　532-535　1993/03

    DOI： 10.1016/0304-8853(93)91262-6 　

    ISSN： 0304-8853

Show all ︎Show first 5

Research Projects 3

  1. Numerical simulations of write head and spin-toque oscillator for microwave-assisted magnetic recording

    KANAI YASUSHI, GREAVES Simon, MURAOKA Hiroaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Niigata Institute of Technology

    2016/04/01 - 2019/03/31

    More details Close

    Spin-torque oscillator (STO) and write head used for microwave-assisted magnetic recording (MAMR), one candidate for the future perpendicular magnetic recording, was investigated by using a computer simulation called micromagnetic simulation. We found that (1) once STO was inserted into write head main pole and trailing shield gap, it was hard to obtain a stable oscillation. Therefore, obtaining a stable STO oscillation is the key to realize the MAMR technology. To obtain a stable STO oscillation (2) small area STO had comparably large high-frequency field for its small area and oscillated stably, (3) STO tilted with regard to the medium surface oscillation stably, (4) non-parallel write head gap lead to a stable STO oscillation.

  2. A proposal of high-density, high -requency recording write head for perpendicular magnetic recording in the next generation

    KANAI Yasushi, GREAVES Simon, MURAOKA Hiroaki, YOSHIDA Kazuetsu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Niigata Institute of Technology

    2012/04/01 - 2015/03/31

    More details Close

    For heat-assisted magnetic recording (HAMR), write head structure with dent for optical element, short yoke, and soft magnetic underlayer was proposed, which worked for high-frequency recording current. The maximum areal density of 8 terabit per square-inch was predicted with the write head. For microwave-assisted magnetic recording (MAMR), tilted, not perpendicular to the media plane, spin-torque oscillator (STO) inserted into the tilted write head gap was proposed. The head had a large recording field and stable STO oscillation.

  3. A PROSAL ON MAGNETIC RECORDING WRITE HEADS FOR THE NEXT GENERATIONS

    KANAI Yasushi, MURAOKA Hiroaki, GREAVES Simon, YOSHIDA Kazuetsu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Niigata Institute of Technology

    2009 - 2011

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    The representative researcher investigated and proposed recording write heads in perpendicular magnetic recording system in the next generation : two-dimensional magnetic recording with shingle writing, thermally-assisted magnetic recording, microwave-assisted magnetic recording and bit-patterned magnetic recording. The shielded planar heads are superior to conventional heads with regard to obtaining a faster response and a larger recording field, and even a smaller adjacent track erasure(ATE) field.