All issues
Predecessor
34.26
Displaying 1-17 of 17 articles from this issue
- |<
- <
- 1
- >
- >|
-
Article type: Cover
Pages Cover1-
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (13K) -
Article type: Index
Pages Toc1-
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (60K) -
Masaru ONOSE, Yasuki TANAKA, Ryuta KAWASAKI, Takashi KOMINE, Ryuji SUG ...Article type: Article
Session ID: MR2010-12
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this study, influence if the pt content in a perpendicular anisotropy master medium (PAMM) on the bit printing characteristics was investigated through experiments simulation. As a result, the most excellent printing characteristics were obtained with a Pt content of 10% to 20%. This result could be explained by the fact that the anisotropy and the saturation magnetization corresponded to the Pt content of the PAMM. The optimum printing field of the PAMM was about 1kOe smaller than that of a pure Co or conventional master medium.View full abstractDownload PDF (655K) -
Naoto FUJIWARA, Yoichi NISHIDA, Toshihide ISHIOKA, Ryuji SUGITA, Tadas ...Article type: Article
Session ID: MR2010-13
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWith the increase in recording density and capacity of hard-disk drives (HDD), high speed, high precision and low cost servo writing method has become an issue in HDD industry. The magnetic printing was proposed as the ultimate solution for this issue. There are two types of magnetic printing methods, which are 'Bit Printing (BP)' and 'Edge Printing (EP)'. BP method is conducted by applying external field whose direction is vertical to the plane of both master disk (Master) and perpendicular magnetic recording (PMR) media (Slave). On the other hand, EP method is conducted by applying external field toward down track direction of both master and slave. In BP for bit length shorter than 100nm, the SNR of perpendicular anisotropic master was higher than isotropic master. And the SNR of EP for the bit length shorter than 50nm was demonstrated.View full abstractDownload PDF (413K) -
Tadashi KOBAYASHI, Tatsuya KITAYAMA, Yuji FUJIWARAArticle type: Article
Session ID: MR2010-14
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMedia design for thermally assisted magnetic recording is simulated. Especially, data stability during cooling process after writing and that in the adjacent track in each time of rewriting are taken into consideration. Under the conditions that (1) the thermal stability factor at 330K is more than 60, (2) the cooling rate after writing is less than 10K/nm, and (3) the information on the adjacent tracks should be kept up to 330K under head field, the anisotropy energy of about 1×10^7erg/cm^3 is needed. Although the anisotropy energy can be reduced by increasing the thickness, the Curie temperature should be decreased. If the head field at the adjacent tracks can be decreased, the anisotropy energy will be reduced.View full abstractDownload PDF (980K) -
Shin SAITO, Migaku TAKAHASHIArticle type: Article
Session ID: MR2010-15
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMeasurement of the stacking faults (SFs) formed in a pseudo-hexagonal closed packed (pseudo-hcp) film is proposed using laboratory-scale X-ray diffractometer. The pseudo-hcp structure includes (111)-oriented face centered cubic (fcc), c-plane oriented hcp, and their mediate structures with the SFs. Diffractions from (11.0) and (10.0) planes, D_H and D_L, were observed in the in-plane X-ray diffraction (XRD) profiles of the pseudo-hcp materials. The structure factor revealed that D_H and D_L originates from the number of total atomic layers and the imbalance of the number of A, B, and C atomic layers, respectively. Therefore, the intensity ratio of D_H to D_L, corrected by Lorentz-polarization and atomic scattering factors (corrected I_L/I_H), is defined as the degree of SFs for pseudo-hcp materials from the stacking probability, independent of thickness, compositional atoms, and lattice constants. Theoretical values of the corrected I_L/I_H are 0.25 for perfect hcp stacking and 0 for perfect fcc stacking, and statistical calculations revealed that this index is very sensitive to the approach of perfect hcp stacking order rather than that of perfect fcc stacking order. By applying this evaluation to experimentally sputtered thin films, it was clarified that critical number of valence electron for fcc-hcp transition was found to be "9" for a transition-metal alloy thin film. Proposed evaluation is quite useful for material and process development of perpendicular recording media.View full abstractDownload PDF (1632K) -
Sakae Meguro, Shin Saito, Kouichi Akahane, Migaku TakahashiArticle type: Article
Session ID: MR2010-16
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRecently, the development of the energy efficient equipment is driven by environmental problems and the energy resource depletion problem. The energy loss associated with the motors and the transformers is a huge amount, and it is necessary to execute the efficiency improvement on these devices in order to decrease the global environment stress. For these devices, an analysis means for which the magnetic process by the domain observation is very useful in an amorphous strips and the flat rolled magnetic steel sheets. However, there was a problem that the size of the device was large and the evaluation over a large area was necessary. We have developed the Kerr effect microscope that can promptly evaluate the magnetic district structure of micron order. This time, we applied the basic technology established in the Kerr microscope optical system to the focused optical system. As a result, we developed the wide viewing domain imaging device witch can observe the magnetic domain of the mm order, and can detect the direction of the magnetization.View full abstractDownload PDF (1017K) -
Fumiko AKAGI, Akemi HIROTSUNE, Hiroaki NEMOTO, Takuya MATSUMOTO, Yasut ...Article type: Article
Session ID: MR2010-17
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe studied the head/medium conditions to achieve an areal recording density of 1Tb/in^2-2.5Tb/in^2 using micromagnetic simulation. We note that the experimental results, for example, the dependence of MH loops of CoB/Pd multilayer medium with high H_k and anisotropy energy on temperature, were considered as the modeling of the media for simulation and read/write characteristics were calculated accurately.View full abstractDownload PDF (1014K) -
Y. K. Takahashi, L. Zhang, A. Perumal, K. HonoArticle type: Article
Session ID: MR2010-18
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have succeeded in the fabrication of L1_0-FePt-C granular film with an average particle size of 6.7nm, a size distribution of 1.5nm with a strong c-axis texture. The double-layered media with FePt-C granular film and Fe-Ta-C nanocrystalline soft magnetic underlayer showed the thermal stability (K_uV/K_BT) of 81 and H_c distribution of 0.31, which is comparable to the current CGC media (250Gb/in^2). By adding a small amount Ag into the FePt-C granular film, the degree of L1_0 order improved to 1. (FePt)_<90>Ag_<10>-50vol.%C showed excellent mediastructure with the average particle size of 6.1nm, the size distribution of 1.8nm with a strong c-axis texture and high H_c of 37kOe, suggesting the film structure is rather promising for HAMR.View full abstractDownload PDF (1599K) -
Akihito NAKAJIMA, Kiyoto KATAKURA, Tomohiro OHORI, You KONDO, Manabu Y ...Article type: Article
Session ID: MMS2010-26
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSOne of the problems that affect the practical use of holographic memory is deterioration of reproduced images due to aberration in the optical system. This paper studied the influence of wavefront aberration on signal quality and the effect of FIR filter to improve the reproduced signal quality.View full abstractDownload PDF (892K) -
Akemi HIROTSUNE, Hiroaki NEMOTO, Ikuko TAKEKUMA, Kimio NAKAMURA, Takay ...Article type: Article
Session ID: MR2010-19
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe effect of the magnetic and structural properties on recording performance was investigated. Well grain-isolated media were obtained by adding boron and oxygen into the [Co/Pd]_n multilayer and cooling the substrate. We found that the recorded bit size could be decreased by reducing the magnetic cluster size. Twenty-five-nm bits were successfully recorded with thermal assist on the improved media with a magnetic cluster size of about 30nm.View full abstractDownload PDF (829K) -
Takeshi KAWAMAE, Takuji MURAKOSHI, Takashi KOMINE, Ryuji SUGITAArticle type: Article
Session ID: MR2010-20
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe perpendicular magnetic printing characteristics on exchange coupled composite (ECC) media are investigated using micromagnetic simulation. It is clarified that magnetic printing onto ECC media is feasible. Master patterns were clearly printed onto ECC or semi-ECC media with coherent rotation of magnetizations in hard and soft layers. The optimum printing characteristics in ECC or semi-ECC media is the same as that of single-layered (SL) medium. When the thermal stabilities in SL and ECC media are the same, the optimum printing field for ECC medium is lower than that of SL medium. To obtain sufficient printing characteristics in ECC media, the ECC media need stronger interlayer exchange coupling than that of semi-ECC media.View full abstractDownload PDF (824K) -
T. Takahashi, Y. Ishikawa, K. Yoshida, Y. KanaiArticle type: Article
Session ID: MR2010-21
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMicrowave-assisted magnetic recording (MAMR) has recently emerged as a candidate to solve the trilemma in magnetic recording. In MAMR a device that can generate higher frequency magnetic field than 20GHz is necessary. A spin torque oscillator (STO) that comprises three magnetic layers, a reference layer, a field generating layer and a perpendicular layer, was proposed by J-G. Zhu. Also, the authors proposed an STO that comprises two layers, eliminating a perpendicular layer, which utilizes a magnetic materials with large negative magnetic anisotropy as a field generating layer. They showed that the STO possesses several excellent oscillating properties. However, the STOs above mentioned have a problem that they require an extraordinarily large positive or negative anisotropy. We have investigated the possibilities that well known magnetic materials with ordinal magnitude of magnetic anisotropy can be utilized as a field generating layer in place of large anisotropy materials. In this report the oscillating behaviors of the STO with perpendicular anisotropy are described, comparing with the STO with negative anisotropy.View full abstractDownload PDF (790K) -
Takeshi HARASAWA, Ryota SUZUKI, Atsushi MUSHA, Osamu SHIMIZU, Hitoshi ...Article type: Article
Session ID: MMS2010-27
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe developed very high areal density recording tape for linear tape system which showed feasibility above 20Gbits/in2 using barium-ferrite magnetic particles by applying new technologies listed below. 1) fine barium-ferrite particles with 1600nm3 in particle volume, 2) perpendicular orientation, 3) smooth surface, especially in long waviness region (1um or more) measured with optical interferometry surface roughness meter.View full abstractDownload PDF (947K) -
Article type: Appendix
Pages App1-
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (87K) -
Article type: Appendix
Pages App2-
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (87K) -
Article type: Appendix
Pages App3-
Published: July 08, 2010
Released on J-STAGE: September 21, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (87K)
- |<
- <
- 1
- >
- >|