ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
Search
Advanced search
OR
Browse
Search
32.28
Displaying 1-14 of 14 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (13K)
  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (61K)
  • Magnetic recording performance of 'Bit Printing method' on PMR media and its extendibility to the higher areal density
    Atsushi Morooka, Makoto Nagao, Tadashi Yasunaga, Katsuhiro Nishimaki
    Article type: Article
    Session ID: MMS2008-39
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Servo pattern printing which supports bulk magnetic transfer of the servo pattern is expected to be the ultimate solution for PMR media servo track writing method. We examined 'Bit printing (BP)' characteristic of the short bit length recording and its extendibility for PMR media. The waveform of BP at 70 nm bit was equivalent to the head writing in its shape and amplitude. The spacing loss factor of BP was small enough, and the optimum performance was obtained with the Ha close to media He. There was no significant concern to increase Ha on BP, and BP was suitable for the future short bit length pattern.
    View full abstract
    Download PDF (559K)
  • Analysis of Perpendicular Magnetic Contact Printing by Using Enlarged Model
    Kazuhiro TANABE, Toshiaki SAITO, Nurul Sheeda, Takashi KOMINE, Ryuji S ...
    Article type: Article
    Session ID: MMS2008-40
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_5
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    The influence of the inclination angle of the master pattern on the printing characteristics during the formation of a phase servo pattern on perpendicular magnetic recording media by edge printing was investigated by using an enlarged model. The perpendicular components of both the recording field and the magnetization of the printed slave medium decreases as the inclination angle of the master pattern increases. The influence of the inclination angle of the master pattern on the magnetization is small in comparison with the influence on the recording field, and even for an angle of 40 degrees, edge printing on slave media is possible.
    View full abstract
    Download PDF (779K)
  • Influence of Notch Shape and Size on Current-Driven Domain Wall Motions in a Magnetic Nanowire
    Hiroshi Murakami, Takashi KOMINE, Ryuji SUGITA
    Article type: Article
    Session ID: MMS2008-41
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_11
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Herein, we introduce a classical expression for describing a spin-polarized current, and propose the effect of a spin-polarized current with a spatial distribution in a micromagnetic framework. The electric current was calculated on the basis of the resistance between neighboring cells in the calculation region. The effect of a spin-polarized current crossing a domain wall in a thin and narrow permalloy strip with a notch was elucidated by micromagnetic calculation. When the magnetic strip has a notch, the highest current density around the notch in the magnetic strip is dominant for domain wall motion. The critical current density increases as the notch size increases. Below the critical current, the domain wall tends to vibrate around the notch. The natural frequency of the wall vibration spectrum increases as the notch size increases, whereas it is almost independent of the current density.
    View full abstract
    Download PDF (863K)
  • Investigation on Magnetic Fields from Field Generating Layer in MAMR
    Kazuetsu YOSHIDA, Eisei UDA, Natsuumi UDAGAWA, Yasushi Kanai
    Article type: Article
    Session ID: MMS2008-42
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Microwave-assisted magnetic recording (MAMR) has recently emerged as a candidate to solve the trilemma in magnetic recording. In this study, the fundamental characteristics of the magnetic fields generated by a field-generating layer (FGL) are investigated using micromagnetic simulations. The relationships between the fields generated by the FGL and magnetic parameters, such as interlayer exchange coupling strength (Ax) and the anisotropy constant (K), are investigated. In addition, oscillation behaviors are investigated by examining the magnetization configurations of the FGL. A Bloch-line-like magnetic structure is observed in the FGL in the stable oscillation mode. The Bloch-line-like structure functions as a rotation axis. However, it disappears in the unstable oscillation mode.
    View full abstract
    Download PDF (515K)
  • A Study on Conifiguration of Recording Code for Perpendicular Magnetic Recording Channel with Thermal Decay
    Hisashi OSAWA, Yuzo TAKAHASHI, Yoshihiro OKAMOTO, Yasuaki NAKAMURA, Hi ...
    Article type: Article
    Session ID: MMS2008-43
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_21
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    The configuration of the suitable recording code for a partial response maximum likelihood (PRML) system in a perpendicular magnetic recording channel with thermal decay is discribed. The relationships between the run-length of recording code and the error frequency in PR1ML system for the newly configured 64/65(0,12/14) and 128/129(0.16/18) codes and the conventional 128/130(0.16/8) code as the run-length-limited (RLL) code are obtained for two kinds of media with different thermal stability. Moreover, the relationships between the elapsed time and the symbol error rate are obtained for these three kinds of codes and their performances are compared. The results show that the 128/129(0,16/18) code gives the best performance for the medium with good thermal stability, and the 64/65(0.12/14) code provides the best performance after a long time for the medium with poor thermal stability.
    View full abstract
    Download PDF (807K)
  • Nano-structure and Magnetic Property of CoPt-TiO_2 Perpendicular Magnetic Recording Film
    Kazuyoshi HASHIMOTO, Yuya NAGASAKI, Tetuya TODA, Jin ONUKI, Jun ARIAKE ...
    Article type: Article
    Session ID: MMS2008-44
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_27
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    The magnetic characteristics and nano-structures of CoPt-TiO_2/Ru/Pt/SiO_2 layered magnetic films were investigated as a function of the thickness of Ru under-layer using X-ray diffraction and Auger electron spectroscopy. It was found that He of layered films increased with the thickness of Ru under-layer. Above result was found to be caused by the fact that the grain size increase and high hep c-axis orientations of CoPt film were obtained by the increase of the thickness of Ru under-layer.
    View full abstract
    Download PDF (595K)
  • An approach to evaluate magnetic properties of composite perpendicular media using anomalous Hall effect
    Sarbanoo Das, Takayuki Ichihara, Hiroyuki Suzuki, Yoshibumi Matsuda
    Article type: Article
    Session ID: MMS2008-45
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Thickness dependence of cap layer and soft underlayer (SUL), two important layers in a perpendicular magnetic recording (PMR) medium, has been investigated using the Hall effects measurement method. Hall voltage was found to be increasing with increasing cap layer thickness, which is quite different from that of a single layer ferromagnetic thin film case, where the Hall voltage is inversely proportional to the film thickness. For a fixed cap layer thickness, Hall voltage was found to be increasing with decreasing SUL thickness. The method can be applied to monitor the cap layer thickness in the manufacturing of capped media. A bi-layer model based on the experimental data predicts that in a stacked structure of different magnetic thin films with different anomalous Hall coefficients there exists a region where Hall voltage increases with increasing thickness of a layer compared to another one.
    View full abstract
    Download PDF (571K)
  • Control of Curie temperature of c-axis oriented FePt films and fabrication method of FePt films using MgO templete
    Yasuharu Imai, Jun-ichi Ikemoto, Shigeki Nakagawa
    Article type: Article
    Session ID: MMS2008-46
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_39
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    FePt ordered alloy with (001) preferential orientation is a hopeful candidate as a next-generation high density magnetic recording medium, especially, heat assisted magnetic recording medium and bit patterned medium, hi this report, the controllability of FePt(Cu) ordered alloy thin films as the heat assisted magnetic recording media and fabrication method of FePt ordered alloy using MgO (100) preferential orientated films as the future self-assembly patterned media were investigated. It is possible to control Curie temperature from 150 ℃ to 250 ℃ by changing the amount of Cu in FePt(Cu) films, hi the fabrication method of FePt using MgO (100) oriented films, It was confirmed that Fe atoms in the Fe layer beneath the MgO layer diffuses up to MgO surface by heating MgO(100)/Fe(100) films prepared with reactive sputtering. Besides, using this experimental results, we succeeded in fabricating FePt(Cu) ordered alloy films.
    View full abstract
    Download PDF (846K)
  • Deposition of Granular Tape Media on Moving Substrate by Facing Targets Sputtering
    Satoshi MATSUNUMA, Tetsutaro INOUE, Tsugihiro DOI, Toshimitsu MATSUU, ...
    Article type: Article
    Session ID: MMS2008-47
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_45
    CONFERENCE PROCEEDINGS FREE ACCESS
    Show abstractHide abstract
    Longitudinal recording media with granular magnetic film were fabricated by Facing targets sputtering (FTS). Effect of moving speed (100 cm/min and 5.8 cm/min) on microstructure of the CoPtCr-SiO_2 granular film was investigated. Moving speed does not affect microstructure of its granular column with average diameter of 8 nm grown by FTS. Straight columnar grain was observed by cross-sectional transmission electron microscopy (TEM). Playback test shows that the sputtered media has 8 dB higher SNR than 0.5 Gb/in^2 class commercial particulate tape media.
    View full abstract
    Download PDF (724K)
  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (78K)
  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (78K)
  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: July 10, 2008
    Released on J-STAGE: September 20, 2017
    DOIhttps://doi.org/10.11485/itetr.32.28.0_App3
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (78K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top