• Title/Summary/Keyword: thin film media

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The Improvement of Magnetic Properties of Co-Cr Thin Film for Perpendicular Magnetic Recording Media (수직자기기록매체용 Co-Cr 박막의 자기적 특성 개선에 관한 연구)

  • 공석현;금민종;최형욱;최동진;김경환;손인환
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.5
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    • pp.444-450
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    • 2000
  • We prepared Co-Cr thin film for perpendicular magnetic recording media with facing targets sputtering system(FTS system) which can deposit a high quality thin film in plasma-free state and wide range of working pressure. The effect of sputtering conditions(argon gas pressure and substrate temperature) on the magnetic and the crystallographic characteristic of Co-Cr thin film was investigated. And the variation of perpendicular coercivity with the variation of film thickness was studied. As a result we obtained the high perpendicular coercivity of 1900Oe and the good dispersion angle of c-axis($\Delta$$\theta$$_{50}$) of 5$^{\circ}$on the film thickness of 100nm for the promising recording layer of perpendicular magnetic recording media.c recording media.a.

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Control of Thin Film Media Microstructure by Using Very Thin Seedlayer Material with Different Affinity for Oxygen

  • Djayaprawira, D.D.;Yoshimura, Satoru;Takahashi, Migaku
    • Journal of Magnetics
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    • v.7 no.3
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    • pp.106-114
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    • 2002
  • To reduce the grain size and the media noise in a typical CrMo/CoCrPtB longitudinal media, a sputtering process which includes the exposure of oxygen onto the surface of CrW$_x$ (x=0, 25, 50, 75, 100 at.%) and CrTi$_{15}$ seedlayers with the thickness of 0.5 nm have been utilized. The main results are: (1) the media grain size and the media noise are reduced when using CrW$_x$ (x=0, 25, 50 at.%) seedlayers, and not reduced when using CrTils or CrW$_x$ (x=75, 100 at.%) seedlayers, (2) AES and RHEED results suggest that W seedlayer, which has the highest melting point, forms layer-like film with very small and dense island grain, due to its high free surface energy and low mobility. On the other hand, CrW$_{50}$ and Cr seedlayers, which have lower melting point than W seedlayer, form island film, (3) to effectively reduce the media grain size and improve the media signal to noise ratio, it is essential to utilize a very thin Cr-based seedlayer with high affinity for oxygen and which forms island-like structure, such as CrW$_{50}$ seedlayer.

Study on Scratch Characteristics of HDD Media and ZnO Thin Films by Ramp Loading Scratch Method (Ramp Loading Scratch 방법을 이용한 상용 HDD Media와 ZnO박막소재의 Scratch 특성에 관한 연구)

  • Kim, Dae-Eun;Lee, Jung-Eun;Lin, LiYu
    • Tribology and Lubricants
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    • v.24 no.2
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    • pp.77-81
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    • 2008
  • In this work, ramp loading scratch method was used to evaluate the scratch characteristics of HDD media and ZnO thin films. Commercially available HDD media and ZnO thin films grown on silicon(100) substrate by sol-gel method were used. As for the ZnO films, the effects of annealing temperature after the film deposition process were also investigated. A custom built scratch tester was used to scratch the specimen under a ramp loading condition. The scratch track formed by ramp loading was measured by optical microscope and Atomic Force Microscopy (AFM). The wear depth and width were used to assess the scratch characteristics of the HDD Media and ZnO thin films. The results showed that ZnO film annealed at $800^{\circ}C$ had the best scratch resistance property. Also, the HDD media showed overall better scratch resistance than the ZnO films.

The Improvement of Magnetic Properties of CoCr Thin Film for Perpendicular Magnetic Recording Media (수직자기기록매체용 CoCr박막의 자기적 특성 개선에 관한 연구)

  • 공석현;손인환;최형욱;최동진;김경환
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.419-422
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    • 1999
  • We prepared CoCr thin film for perpendicular magnetic recording media by facing targets sputtering system(FTS system) which can deposit a high quality thin films in plasma-free state and wide range of working pressure. In this study, we investigated that the effect of sputtering condition , that Argon gas pressure and substrate temperature, on magnetic and crystallographic characteristic of CoCr thin film as well as the variation perpendicular coercivity in changing of film's thickness. Crystallographic and magnetic characteristic of prepared thin films were evaluated by x-ray fractometry(XRD), vibrating sample magnetometer(VSM) and kerr hysteresis loop measurement.

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Thin Film Growth and Evaluation Method for Conventional Co-Cr Based Perpendicular Magnetic Recording Media: Problems and New Solutions

  • Saito, Shin;Hoshi, Fumikazu;Hasegawa, Daiji;Takahashi, Migaku
    • Journal of Magnetics
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    • v.7 no.3
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    • pp.115-125
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    • 2002
  • We proposed a novel method to evaluate the magnetic properties of the initial layer and the columnar structure separately for CoCr-based perpendicular recording media. We show that the thickness of the initial layer and the intrinsic magnetocrystalline anisotropy of columnar structure can be quantitatively evaluated using the plotted product of perpendicular anisotropy to magnetic film thickness versus magnetic film thickness ($K_{u{\bot}}^{ex{p.}}$ $\times$ d$_{mag.}$ vs. d$_{mag.}$ plot). Based on the analyses, it is found that: (1) compared with CoCrPtTa media, CoCrPtB media have relatively thin initial layer, and have fine grains with homogeneous columnar structure with c-plane crystallographic orientation; (2) CoCrPtB media can be grown epitaxially on Ru or CoCr/C intermediate layer, and as the result, the magnetic properties of the media within thin thickness region of d$_{mag.}$ $\leq$ 20 nm is significantly improved; (3) the key issue of material investigation for CoCr-based perpendicular recording media will be focused on how to fabricate c-plane-oriented columnar grains well isolated with nonmagnetic substance in epitaxial-growth media, while maintaining the thermal stability of the media.

Low-Temperature Processed Thin Film Barrier Films for Applications in Organic Electronics (유기전자소자 적용을 위한 저온 공정용 배리어 박막 연구)

  • Kim, Junmo;An, Myungchan;Jang, Youngchan;Bae, Hyeong Woo;Lee, Wonho;Lee, Donggu
    • Journal of Sensor Science and Technology
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    • v.28 no.6
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    • pp.402-406
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    • 2019
  • Recently, semiconducting organic materials have been spotlighted as next-generation electronic materials based on their tunable electrical and optical properties, low-cost process, and flexibility. However, typical organic semiconductor materials are vulnerable to moisture and oxygen. Therefore, an encapsulation layer is essential for application of electronic devices. In this study, SiNx thin films deposited at process temperatures below 150 ℃ by plasma-enhanced chemical vapor deposition (PECVD) were characterized for application as an encapsulation layer on organic devices. A single structured SiNx thin film was optimized as an organic light-emitting diode (OLED) encapsulation layer at process temperature of 80 ℃. The optimized SiNx film exhibited excellent water vapor transmission rate (WVTR) of less than 5 × 10-5 g/㎡·day and transmittance of over 87.3% on the visible region with thickness of 1 ㎛. Application of the SiNx thin film on the top-emitting OLED showed that the PECVD process did not degrade the electrical properties of the device, and the OLED with SiNx exhibited improved operating lifetime

Durability Improvement of Metal Convex Printing Plate for Securities Printing (유가증권 인쇄용 금속 볼록판의 내구성 향상에 관한 연구)

  • Lee, Hyok-Won;Kang, Young-Reep;Kim, Byong-Hyun
    • Journal of the Korean Graphic Arts Communication Society
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    • v.29 no.3
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    • pp.133-142
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    • 2011
  • We produce a photosensitive convex plate to research a Nickel metal relief printing plate using galvanic process. A Method for preparing DLC convex plate that is metalized on Nickel metal relief printing plate using CVD(Chemical Vapor Deposition) process and $N_2DLC$-convex plate that is DLC metalized thin film layer of $N_2$ plasma surface treatment are comprised. DLC thin film layers on Nickel surface are fragile. The results of the research indicate that the coefficient of friction on DLC metalized thin film layer is relatively low than Nickel surface and the durability of Nickel surface coated DLC metalized thin film layer is superior to Nickel surface. A relative evaluation of three form plate wetting properties using varnish liquid-drop plate indicates superior printing aptitudes for $N_2DLC$, DLC, Nichel plate order as above.

Magnetic Properties of Co-Cr(-Ta)/Si Bilayered Thin Film (Co-Cr(-Ta)/Si 이층막의 자기적 특성)

  • 김용진;박원효;금민종;최형욱;김경환;손인환
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.3
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    • pp.281-286
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    • 2002
  • In odder to investigate the magnetic properties of CoCr-based bilayered thin films on kind of underlayer, we introduced amorphous Si layer to Co-Cr(-Ta) magnetic layer as underlayer. First, we prepared CoCr and CoCrTa single layer using the Facing Targets Sputtering system to investigate theirs properties. It was revealed that with increasing the film thickness of CoCr, CoCrTa single layer, crystalline orientation and perpendicular coercivity was improved. The CoCrTa thin film showed bettor crystalline and magnetic characteristics than CoCr thin film. As a result of investigating magnetic properties of CoCr and CoCrTa magnetic layer on introducing the Si underlayer, perpendicular coercivity and saturation magnetization of CoCr/Si and CoCrTa/Si bilayered thin film were decreased due to the increased grain size and diffusion of Si atoms to magnetic layer. And they showed constant with increasing the film thickness of Si thin film. However, in case of CoCrTa/Si bilayered thin film, in-plane coercivity was controlled low at about 250Oe. The c-axis orientations of CoCr/si and CoCrTa/Si bilayered thin film showed a good crystalline characteristics as about $2^{\circ}$.

2-D FEM ANALYSIS OF LONGITUDINAL MAGNETIC RECORDING MEDIA TAKING ACCOUNT OF HYSTERESIS MODEL

  • Seol, S.C.;Kang, T.;Shin, K.H.;Lee, T.D.;Park, G.S.
    • Journal of the Korean Magnetics Society
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    • v.5 no.5
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    • pp.631-635
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    • 1995
  • Longitudinal magnetic recording process of thin film media was simulated by the 2-D finite element method (FEM). To describe precisely the hysteresis behavior of thin film media, scalar Preisach model was used. In this paper, we discussed the formation of bit patterns and importance of modeling of minor loops in high density recording. The effects of the media coercivity and film thickness on the remanent magnetization and transition shape were investigated.

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Application of Vector Moving Preisach Model to Longitudinal Thin Film Media

  • S. C. Seol;T. Kang;K. H. Shin;Lee, T. D.;Park, G. S.
    • Journal of Magnetics
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    • v.2 no.3
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    • pp.101-104
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    • 1997
  • Vector Moving Preisach model has been applied to the unoriented Co-based alloy thin film media. In the model, the out-of plane easy axis distribution of the particles was derived directly from the texture coefficient phkl obtained from XRD analysis, which corresponds to the fraction of the grains that have the {hkl} plane lying parallel to in-plane direction. The model was validated, by its prediction of a variety of responses, including major loop, minor loop, and the angular dependence of coercivities.

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