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Displaying 1-8 of 8 articles from this issue
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Article type: Cover
Pages Cover1-
Published: June 10, 1999
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (14K) -
Article type: Index
Pages Toc1-
Published: June 10, 1999
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (35K) -
Naoki HONDA, Takanori KIYA, Jun ARIAKE, Kazuhiro OUCHIArticle type: Article
Session ID: VIR99-59
Published: June 10, 1999
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSNoise origin was investigated for double layered perpendicular recording media using noise spectrum analyses and MFM observations. The medium noise was found to be originated from two sources from the recording layer and the backlayer related. The intrinsic noise of the former showed a quasi-white noise property similar to that of a single layer perpendicular medium, and the latter showed a transition noise property similar to longitudinal recording media except with a lower frequency noise component. The reduction of the latter noise is required for low noise media. The noise related to the backlayer could be reduced by using either high pressure sputtering or addition of nitrogen gas for preparation of the backlayer.View full abstractDownload PDF (750K) -
K. Miura, H. Muraoka, Y. Sugita, Y. NakamuraArticle type: Article
Session ID: VIR99-60
Published: June 10, 1999
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have evaluated the system property for perpendicular magnetic recording such as error rate characteristics. Medium noise of perpendicular magnetic recording is not presently small, which limits performance at high recording density, so the guidance of noise reduction is immediately required. In this paper, we tried to specify the spatial noise occurrence point on medium by time domain analysis for singlepole head and double layered perpendicular disk. As results, transition jitter noise is more dominant than the noise caused by local reversal domain between transitions. Furthermore, we suspected that transition noise is caused by the size of magnetic cluster on recording layer and analyzed medium noise using new simulation model for perpendicular medium.View full abstractDownload PDF (1030K) -
Ryoichi NAKATANI, Noboru SHIMIZU, Teruaki TAKEUCHI, Hiromitsu ITABASHIArticle type: Article
Session ID: VIR99-61
Published: June 10, 1999
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe investigated relationship between magnetoresistive effects and barrier heights in "Ni-20at%Fe(15 nm)/insulator(1.5-2.0 nm)/Co-17at%Pt(30 nm)/substrate" magnetic tunneling junctions (MTJ) with various insulating materials. The highest magnetoresistance ratio is obtained in the MTJ with Al-O layer. The magnetoresistance ratio in the MTJ with Mg-Al-O layer is 2-3%. The other MTJ show the magnetoresistance ratios less than 1%. The barrier heights of the MTJ with the Al-O and the Mg-Al-O layers are 2.05 eV and 1.04 eV, respectively. The barrier heights of the other MTJ are 0.55-0.71 eV. It is understood that the magnetoresistance ratio becomes high as the barrier height becomes high.View full abstractDownload PDF (460K) -
Kaori TAGUCHI, Kiyoshi YAMAKAWA, Kazuhiro OUCHIArticle type: Article
Session ID: VIR99-62
Published: June 10, 1999
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSWe have investigated writing properties of a single pole head with narrow track width for high track density recording. We have fabricated the single pole head whose main pole is made from Fe-Si-N film having Bs of as high as 1.9 T. The head was trimmed into narrow tack width using a focused ion beam system. The write properties of the head were evaluated using double layer media for perpendicular magnetic recording. Narrow track recording with a high resolution was demonstrated for a track width as narrow as 0.3 μm.View full abstractDownload PDF (917K) -
K. Tsuruta, N. Tanamati, S. Yamamoto, H. Kurisu, M. Matsuura, T. Doi, ...Article type: Article
Session ID: VIR99-63
Published: June 10, 1999
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSCo-γFe_2O_3/NiO thin film disks were prepared by the following method. At first, CoO-Fe_3O_4 thin films were deposited by reactive sputtering using a CoFe alloy sputtering target, and then the CoO-Fe_3O_4 thin films were oxidized by the two method to transform to Co-γFe_2O_3/NiO thin films: one is oxidization in air, and the other is plasma oxidization using electron-cyclotron-resonance microwave plasma combining with Penning ionization effect of He atoms. It was confirmed that the Co-γFe_2O_3/NiO thin film medium prepared by the plasma oxidization showed almost same recording characteristics and better noise characteristics compared with the medium prepared by oxidization in air. Feasibility of the Co-γFe_2O_3/NiO thin film media used as a mother media in magnetic printing application to relatively high coercivity copy medium was also shown.View full abstractDownload PDF (1043K) -
Article type: Appendix
Pages App1-
Published: June 10, 1999
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (75K)
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