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Displaying 1-14 of 14 articles from this issue
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Article type: Cover
Pages Cover1-
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (62K) -
Shigeki NAKAGAWA, Ichiro SASAKI, Atsushi SATO, Masahiko NAOEArticle type: Article
Session ID: VIR2000-19
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSPt seed layer was effective to improve c-axis orientation of Co_<77>Cr_<20>Ta_3 layers deposited on it especially for higher substrate temperature T_s above 200℃. The 50 nm-thick Co_<77>Cr_<20>Ta_3 layer deposited at T_s of 250℃ on Pt underlayer exhibited relatively large perpendicular coercivity H_<c⊥> around 2.5 kOe. Magnetization process under canted magnetic field was clarified using combination of Anomalous Hall measurement and VSM measurement. Those data implied that the Co_<77>Cr_<20>Ta_3/Pt bilayered film did not have transition layer, which possessed worse c-axis orientation at the interface. Pt seed layer is effective to deposit the ultra-thin Co-Cr recording layer and improve its crystallographic and magnetic characteristics.View full abstractDownload PDF (672K) -
Shinya Yamauchi, Mitsuteru Inoue, Toshitaka Fujii, Osamu ShinouraArticle type: Article
Session ID: VIR2000-20
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSOwing to their large tunneling magnetoresistance effect, metal-nonmetal granular alloy films are now promised as useful materials for high-performance magnetic heads. In general, the granular films exhibit large TMR effect only with a considerably large magnetic field of the order of several kOe, One effective method is the use of granular-in-gap(GIG) structure. It is demonstrated that Fe_<20>Ni_<80> films formed by oblique sputtering have well-defined nano-furrow structures, and Co-Sm-O granular films deposited onto such FeNi films. MR ratio of Co-Sm-O granular film value about 6.6% at 12kOe. MR ratio of NiFe-CoSmO composite film value about 3.0% at 25Oe. From this value, the field sensitivity of Δρ/ρ_0 of the composite film is evaluated to be about 200 times higher than that of the Co-Sm-O single-layer film.View full abstractDownload PDF (589K) -
S. Kuribayashi, A. Kuwamura, T. Kato, S. Iwata, S. TsumasimaArticle type: Article
Session ID: VIR2000-21
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTa_2O_5 thin film waveguides were prepared by RF magnetron sputtering system onto the fused quartz substrates. As- sputtered Ta_2O_5 films have a refractive index of n=2.11 which agrees well with the previous reported value of n=2.2. The sample surface measured by AFM is found to be sufficiently flat(the roughness of surface is estimated to be ∿ 2 nm.). The surface roughness increased to ∿ 20 nm after annealing of 800 ℃ for 1 hour. The Ta_2O_5 films with the thicknesses of 500 nm and 1 μm exhibited the transmission loss of ∿ -4.7 dB/cm at 633 nm measured by the prism - film coupler. The 2 μm width Ta_2O_5 optical waveguide having a sharp edge and a flat film surface was fabricated by the photo lithography micro procces.View full abstractDownload PDF (788K) -
K. Nakamura, T. Takayama, K. Yayoi, M. Inoue, T. FujiiArticle type: Article
Session ID: VIR2000-22
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTo confirm the theoretical prediction of one-dimensional magnetophotonic crystals(1D-MPC) experimentally, 1D-MPCs with Bismuth substituted rare-earth iron garnet(Bi:RIG) thin films were fabricated by using pulsed-light rapid annealing was not destroyed multilayer film, and their optical and magneto-optical properties were investigated in detail. The media exhibited considerably high transmittance and Faraday rotation at designated localized wavelengths of light in the photonic bandgap. Faraday rotation of 1D-MPC is several times as large as that of single layer Bi:RIG and agree with calculation value.View full abstractDownload PDF (763K) -
Kashiko Kodate, Fumika SumiyamaArticle type: Article
Session ID: VIR2000-23
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe conducted experiments and computations to examine the data storage conditions of SBN single crystal, which is a photorefractive material, highly sensitive and voltage-free, as media for holographic memory, by measuring basic characteristics such as absorption and diffraction efficiency. In addition, we sought to optimize these conditions with a view to applying SBN single crystal to multi-channel multiplexed memory for reference image database of our facial recognition system and succeeded in recording 120 images(20 channels ×6 pages). Finally, we verified that stored images are identical by checking optical correlation signals of input and reference images.View full abstractDownload PDF (1169K) -
T. Kume, S. Yagi, T. Imai, M. YamamotoArticle type: Article
Session ID: VIR2000-24
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe discuss a digital holographic memory that uses highly sensitive strontium barium niobate as a recording medium. Despite equalizing the diffraction efficiencies of recorded holograms by using schedule recording, we observed degradation of the reconstructed image near the beginning of multiplexing. Concluding that the degradation was caused by medium saturation, we tried to reduce it by using a random phase shifter and modulation code. Random phase shifters were not effective to reduce the medium saturation while 2:4 modulation code could reduce it. As a result we improved the signal-to-noise ratios of the reconstructed images and hence the bit error rates. In 50-times multiplexing, we obtained bit error rates of less than 10^<-3> which can be eliminated by conventional error correction.View full abstractDownload PDF (869K) -
Tomoaki Ryu, Eiji Yokoyama, Noboru Yashima, Hisao Katou, Masayosi Shim ...Article type: Article
Session ID: VIR2000-25
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe playability of DVD players are required better than that of CD players. Two methods to improve the playability of a DVD player is proposed from the view point of servo systems. One is to cancel the tracking offset quickly and accurately caused by the objective lens-shift in the radial direction. Another is to realize stable servo systems even when the optical beam spot crosses on scratch and black dots portion on the surface of the disc. According to experimental results, the offset of the tracking error signal was almost completely cancelled in case of ± 150 μm objective lens-shift. It was also confirmed that stable tracking and focusing servo operation even when the optical beam spot crossed on 2mm length scratch.View full abstractDownload PDF (758K) -
A. Furuya, C. Baubet, H. Yoshikawa, T. Tanabe, M. Yamamoto, P. Tailhad ...Article type: Article
Session ID: VIR2000-26
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe studied ways of controlling changes in the deposition rate of magnetic and magneto-optical recording films and of controlling changes in their structural characteristics and composition during sputtering. Our method of controlling the cathode magnetic field, which we call "magnetic-field-controlled magnetron sputtering", can deposit films while keeping the initial deposition rate during a long sputtering time and can create films whose composition matches that of the target. Using this technique, we found that for iron deposition, the deposition rate could be kept constant and the crystallinity of the films was reproduced even after a long sputtering process. For garnet deposition, there was no compositional change between the target and the film even after a long sputtering process. Thus, this sputtering method is effective at inhibiting compositional change during film deposition.View full abstractDownload PDF (736K) -
Shigeto Takei, Kazuyuki Itoh, Akimitsu Morisako, Mitsunori MatsumotoArticle type: Article
Session ID: VIR2000-27
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this study, the dependencies of the magnetic properties of SmCo/Cr films on Sm concentration, sputtering gas pressure, and sputtering power during the preparation of SmCo layers were studied. The saturation magnetization of the film decreased linearly with the increase in Sm concentration while coercivity of the film with Sm concentration of 25 at.% was the highest. It was found that the coercivity of the SmCo/Cr film depends on the sputtering gas pressure and the sputtering power, and the maximum coercivity was about 4.5 kOe when the film was prepared at 8 mTorr and 30 W. The squareness ratio and the coercivity squareness ratio of the film were about 0.85 and 0.96, respectively.View full abstractDownload PDF (670K) -
P. Fischer, T. Eimuller, G. Schutz, S. Tsunashima, M. Kumazawa, N. Tak ...Article type: Article
Session ID: VIR2000-28
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe X-ray magnetic dichroism(X-MCD), i.e.the dependence of the absorption of circularly polarized X-rays on the magnetization of the absorber exhibits at L-edges of transition metals and M-edges in Rare Earth systems values up to 25%. This can serve as a huge magnetic contrast mechanism in combination with a transmission X-ray microscope(TXM) with Fresnel zone plates as optical elements to image magnetic domains providing a lateral resolution down to about 30nm. Particular features of these new technique are an inherent element-specificity, the possibility to record images in varying external fields within a complete hysteresis loop, the relation of the contrast to local magnetic spin and orbital moments. In this short report it is demonstrated by selected examples that magnetic TXM allows to study the magnetic domain structure in current technical relevant systems like magneto-optics for high density storage media, multilayers for GMR applications and nanostructures for MRAM technology.View full abstractDownload PDF (780K) -
K. Ogawa, S. OgawaArticle type: Article
Session ID: VIR2000-29
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThis paper descrives market and application of today's MO as well as its future trend. The market growth has been 30% per year since 1994 and installed-base of the 3.5in.MO will be well over 7.5 million units of drive and 100 million pcs of media by the end of year 2000. Major application concept has been "DataSave/DataKeep" which temporarily stores files of text-document and digital-image document. The introduction of the GigaMO, based on the MSR-media technology, will provide not only 2 〜 3GB but even 5GB capacity in a surface of 3.5in.MO. Improvement of MO media technology and blue laser will achieve 30GB capacity in 3.5in MO, which will open new MO application in digital motion picture environment.View full abstractDownload PDF (1048K) -
Article type: Appendix
Pages App1-
Published: March 06, 2000
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (83K)
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