All issues
Predecessor
33.28
Displaying 1-14 of 14 articles from this issue
- |<
- <
- 1
- >
- >|
-
Article type: Cover
Pages Cover1-
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (13K) -
Article type: Index
Pages Toc1-
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (55K) -
Article type: Bibliography
Pages Misc1-
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (91K) -
Yuji Ogata, Yasuharu Imai, Shigeki NakagawaArticle type: Article
Session ID: MMS2009-47
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSFePtCu ordered alloy films were fabricated from Cu/Pt/Fe trilayers in order to control their Curie temperature suitable for the operation temperature of media in heat assisted magnetic recording (HAMR) system. It was confirmed that the addition of Cu into FePt films makes Curie temperature of the FePtCu films lower than that of FePt films. The control of Cu content ratio in FePtCu films was performed by adjusting Cu layer thickness of Cu/Pt/Fe trilayers. As increasing Cu thicknesses, their Curie temperature and coercivity decreased adequately for HAMR media.View full abstractDownload PDF (718K) -
Kazuetsu YOSHIDA, Masato YOKOE, Yuuma ISHIKAWA, Yasushi KANAIArticle type: Article
Session ID: MMS2009-48
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMicrowave-assisted magnetic recording (MAMR) has recently emerged as a candidate to solve the trilemma in magnetic recording. In MAMR the magnetizations of recording medium can be switched with much lower magnetic field by magnetic resonance, which requires a higher frequency oscillator than 20GHz. In this study, it is described that Spin-torque Oscillator (STO) using a material with a large negative anisotropy has a possibility to generate higher frequency and stable magnetic field and it is preferable to a conventional oscillator with soft magnetic materials.View full abstractDownload PDF (748K) -
Takeshi HARASAWA, Ayako MATSUMOTO, Atsushi MUSHA, Osamu SHIMIZUArticle type: Article
Session ID: MMS2009-49
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe barium-ferrite tape with 1500nm^3 particles was developed. The authors demonstrated thermal stability for such very fine particles. Using a giant magneto-resistive head and GPR4ML-AR channel model system, we evaluated bit error rate. The results indicated the feasibility of approximately of 15Gbits/in^2 recording density.View full abstractDownload PDF (1051K) -
Hiroaki NISHIO, Hiroshi YAMAMOTOArticle type: Article
Session ID: MMS2009-50
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe reverse field dependence of the normalized magnetization decay and the effect of the ratio of the fluctuation field (H_f) to coercivity (H_c) on the temperature coefficient of coercivity {α(H_c)} were studied for advanced data storage tapes prepared from ultrafine acicular metal particulate (MP) composite and hexagonal platelet Ba-ferrite (BF) particles. The mean volume of particles (V_<phy>) for these tapes varied from approximately 2000-5000nm^3. The effects of the degree of particle orientation (OR) on the normalized magnetization decay and activation volume (V_<act>) were also studied for advanced MP tapes. The values of H_f were not constant, but were largely dependent on the reverse field for ultrafine MP and all of BF tapes. In comparison to MP and BF tapes with approximately same V_<phy>, the normalized magnetization decay and H_f of BF tapes were much larger than that of MP tapes. The smaller the V_<phy> was, the larger the normalized magnetization decay became. The value of α(H_c), which is important for the thermal stability of high-density recording media, increased as the ratio H_f/H_c increased for both tapes. In MP tape with a larger V_<phy> (5300nm^3), increasing the OR was found to decrease the normalized magnetization decay. However, OR values had little effect on the normalized magnetization decay of advanced MP tape with a smaller V_<phy> (1700nm^3) and it was difficult to decrease the irreversible susceptibility that is affected significantly the normalized magnetization decay. These may be attributed to the existence of a few particles approaching the theoretical superparamagnetic limit. The value of V_<act> in the low reverse field, which is a major factor affecting media noise, decreased as OR increased regardless of V_<phy>. To decrease the normalized magnetization decay, it is particularly important to originate in decreasing H_f and increase H_c that related to the anisotropy field and distribution for advanced MP and BF tapes with very small V_<phy>.View full abstractDownload PDF (816K) -
Satoshi Shirotori, Yoshiyuki Kamata, Tmoyuki Maeda, Kazuto Kashiwagi, ...Article type: Article
Session ID: MMS2009-51
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA Co/Pt patterned medium was fabricated by an Ar ion etching process through a self-assembled polymer mask with a diameter of 40nm, and its etching damage was investigated by using the grazing incidence x-ray reflectivity (GIXR) technique. This method is effective for investigating the changes in the morphology of surface and interface. It was found that the surface roughness was increased from 0.5nm to 3.8nm by the etching process, while the roughness of the multilayer structure was not changed. Large roughness at the surface is due to the lack of a dot structure as a result of the over-etching condition. The lack of significant damage to the internal multilayer structure is consistent with the lack of significant degradation in the magnetic characteristics. Ar ion etching is found to be robust for fabricating patterned medium with little damage even in the over-etching condition.View full abstractDownload PDF (991K) -
Kei Hirata, Yoichi Ishida, Keiichi Yanagisawa, Hiroto Kasai, Daisuke S ...Article type: Article
Session ID: MMS2009-52
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe visualized cross-sectional magnetic flux density in the off-track direction in the pseudo soft underlayer (SUL) of perpendicular magnetic recording media. A pseudo-SUL was deposited on the fabricated slider of a perpendicular magnetic recording head, and electron holography was used to visualize and quantify the magnetic flux magnitude and distribution in the pseudo-SUL. We observed the pseudo-SUL magnetized by the write field from the writer pole tip. The magnetic flux magnitude and full width at half maximum increased with an increasing write field. We obtained a relative correspondence in an actual recording situation.View full abstractDownload PDF (927K) -
Takehiko HAMAGUCHI, Hideaki MAEDA, Masafumi MOCHIZUKIArticle type: Article
Session ID: MMS2009-53
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have investigated the effects of stray magnetic field upon a perpendicular magnetic recording system, which consists of a single pole type head and a double-layered perpendicular medium. We found that fields in the plane of the disk could cause serious erasure. In addition, the writing operation significantly enhances this erasure. We checked SER degradation after applying an in-plane field with changing the head skew angle. We devised a new return pole design which was called 'corner step' structure, and confirmed that the alternative structure improves the robustness against external field.View full abstractDownload PDF (666K) -
Shunsuke Gomi, Ken-ichiro Hirata, Toshimitsu Matsuu, Satoshi Matsunuma ...Article type: Article
Session ID: MMS2009-54
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSApplication of crystalline soft magnetic underlayer (SUL) for reduction of the Ru intermediate layer (IML) between recording layer and SUL in perpendicular magnetic recording media has been performed. The use of FeCoB layer as crystalline SUL improves degree of FeCo(110) orientation, and that gives degree of (001) orientation of Ru IML and CoPtCr in CoPtCr-SiO_2 recording layer. Then, FeCoB crystalline SULs with seed layer of Ru or Si/NiFe are fabricated and compared to control degree of (110) orientation of FeCo in FeCoB layer. Ru/FeCoB SUL has high anisotropy field. Si/NiFe seed layer improves (110) preferential orientation of FeCo. Si/NiFe seed layer more improved (110) orientation of FeCo than that of Ru. It was confirmed that the use of Ru/FeCoB layer or Si/NiFe/FeCoB layer causes improvement of (001) orientation of Ru IML, which causes improvement of (001) orientation of CoPtCr. The intensity of (002) diffraction peak of CoPtCr is almost constant even though the thickness of Ru IML changes from 30nm to 1nm. Coercivity and squareness ratio of recording layer maintained the same value in spite of reducing the thickness of the Ru IML from 30nm to 5nm.View full abstractDownload PDF (698K) -
Article type: Appendix
Pages App1-
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (83K) -
Article type: Appendix
Pages App2-
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (83K) -
Article type: Appendix
Pages App3-
Published: July 16, 2009
Released on J-STAGE: September 20, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (83K)
- |<
- <
- 1
- >
- >|