• Title/Summary/Keyword: co-deposition

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Comparison between Bi-superconducting Thin Films Fabricated by Co-Deposition and Layer-by-Layer Deposition

  • Yang, Sung-Ho;Park, Yong-Pil
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.9
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    • pp.796-800
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    • 2000
  • Bi$_2$Sr$_2$Ca$_{n}$Cu$_{n+1}$ O$_{y}$(n$\geq$0; BSCCO) thin film is fabricated via two different processes using an ion beam sputtering method i.e. co-deposition and layer-by-layer deposition. A single phase of Bi2212 can be fabricated via the co-deposition process. While it cannot be obtained by the layer-by-layer process. Ultra-low growth rate in our ion beam sputtering system brings out the difference in Bi element adsorption between the two processes and results in only 30% adsorption against total incident Bi amount by layer-by-layer deposition, in contrast to enough Bi adsorption by co-deposition.on.n.

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Comparison between BSCCO Thin Films Fabricated by Co-Deposition and Layer-by-Layer Deposition

  • Lee, Hee-Kab;Park, Yong-Pil;Lee, Joon-Ung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.230-234
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    • 2000
  • Bi$_2$Sr$_2$Ca$_{n}$Cu$_{n+1}$ O$_{y}$(n$\geq$0; BSCCO)thin film is fabricated via two different processes using an ion beam sputtering method i.e. co-deposition and layer-by-layer deposition. A single phase of Bi2212 can be fabricated via the co-deposition process. While it cannot be obtained by the layer-by-layer process. Ultra-law growth rate in our ion beam sputtering system brings out the difference in Bi element adsorption between the two processes and results in only 30% adsorption against total incident Bi amount by layer-by-layer deposition, in contrast to enough Bi adsorption by co-deposition.on.n.

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Characteristics of Bi-superconducting Thin Films Prepared by Co- and Layer-by-Layer Deposition

  • Yang, Sung-Ho;Park, Yong-Pil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.10a
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    • pp.40-44
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    • 2000
  • $Bi_2Sr_2Ca_nCu_{n+1}O_y$($n{\geq}0$; BSCCO)thin film is fabricated via two different processes using an ion beam sputtering method i.e. co-deposition and layer-by-layer deposition. A single phase of Bi2212 can be fabricated via the co-deposition process. While it cannot be obtained by the layer-by-layer process. Ultra-low growth rate in our ion beam sputtering system brings out the difference in Bi element adsorption between the two processes and results in only 30% adsorption against total incident Bi amount by layer-by-layer deposition, in contrast to enough Bi adsorption by co-deposition.

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Effects of Complex Agents and pH on the Deposition Behavior of Electroless Ni-Co-P Film (착화제와 pH가 무전해 Ni-Co-P 도금 피막의 석출거동에 미치는 영향)

  • Choi, Byuck-Keun;Yang, Seung-Gi;Shin, Ji-Wung;Hwang, Woon-Suk
    • Corrosion Science and Technology
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    • v.13 no.3
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    • pp.107-111
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    • 2014
  • Electroless plated Ni-Co-P films have been used to suppress the electromagnetic waves from magnetic recording media, and the suppression is known to be achieved with films made with optimized plating composition and plating condition. Effects of complexing agents on the deposition rate and bath stability of Ni-Co-P film were studied using sodium citrate, sodium tartrate and multi-complex agents containing both of them. Deposition of electroless Ni-Co-P platings was dependent upon the complexing agents. Deposition rate was twice when using sodium tartrate compared to that using sodium citrate. And it was slightly slower with multi-complex agents than with sodium tartrate, bath stability being declined in the former. Deposition rate increased with increasing pH until pH 11. Excellent bath stability and good deposition rate were obtained using multi-complex agent as sodium citrate 0.10 mol/L and sodium tartrate 0.15 mol/L in the electroless Ni-Co-P plating films.

XRD Patterns and Bismuth Sticking Coefficient in $Bi_2Sr_2Ca_nCu_{n+1}O_y(n\geq0)$ Thin Films Fabricated by Ion Beam Sputtering Method

  • Yang, Seung-Ho;Park, Yong-Pil
    • Journal of information and communication convergence engineering
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    • v.4 no.4
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    • pp.158-161
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    • 2006
  • [ $Bi_2Sr_2Ca_nCu_{n+1}O_y(n{\geq}0)$ ] thin film is fabricatedvia two different processes using an ion beam sputtering method i.e. co-deposition and layer-by-layer deposition. A single phase of Bi2212 can be fabricated via the co-deposition process. While it cannot be obtained by the layer-by-layer process. Ultra-low growth rate in our ion beam sputtering system brings out the difference in Bi element adsorption between the two processes and results in only 30% adsorption against total incident Bi amount by layer-by-layer deposition, in contrast to enough Bi adsorption by co-deposition.

WC-Co coating by cold spray deposition (Cold spray를 이용한 WC-Co 코팅)

  • 김형준;황순영;권영각
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.311-313
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    • 2004
  • WC-12-17%Co powders with nano- and micro-structures were deposited by cold spray process using nitrogen and helium gases. The results show that there is no detrimental phase transformation and/or decarburization of WC by cold spray deposition as expected. It is also observed that nano-sized WC in the feedstock powder is maintained in the cold spray deposition. It is demonstrated that it is possible to fabricate the nano-structured WC-Co coating with low porosity and very high hardness (-2050 HV) by cold spray deposition with reasonable powder preheating.

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Growth optimization of CeCoIn5 thin films via pulsed laser deposition

  • Rivasto, Elmeri;Kim, Jihyun;Tien, Le Minh;Kang, Ji-Hoon;Park, Sungmin;Choi, Woo Seok;Kang, Won Nam;Park, Tuson
    • Progress in Superconductivity and Cryogenics
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    • v.23 no.3
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    • pp.41-44
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    • 2021
  • We developed an optimization process of the pulsed laser deposition method to grow epitaxial CeCoIn5 thin films on MgF2 substrates. The effects of different deposition parameters on film growth were extensively studied by analyzing the measured X-ray diffraction patterns. All the deposited films contained small amounts of CeIn3 impurity phase and misoriented CeCoIn5, for which the c-axis of the unit cell is perpendicular to the normal vector of the substrate surface. The deposition temperature, target composition, laser energy density, and repetition rate were found effective in the formation of (00l)-oriented CeCoIn5 as well as the undesired phases such as CeIn3, misoriented CeCoIn5 along the (112) and (h00). Our results provide a set of deposition parameters that produce high-quality epitaxial CeCoIn5 thin films with sufficiently low amounts of impurity phases and can serve as a reference for future studies to optimize the deposition process further.

Study of CO Oxidation on Bare and $TiO_2$-coated NiO/$Ni(OH)_2$

  • Nam, Jong-Won;Kim, Kwang-Dae;Kim, Dong-Wun;Seo, Hyun-OoK;Kim, Young-Dok;Lim, Dong-Chan
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.08a
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    • pp.109-109
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    • 2011
  • CO oxidaition reacitvity of bare and $TiO_2$ -coated NiO/$Ni(OH)_2$ nanoparticles was studied. For the deposition of $TiO_2$ atomic layer deposition was used, and formation of three-dimensional island of $TiO_2$ on NiO/$Ni(OH)_2$ could be identified. Based on the data of X-ray Photoelectron Spectroscopy, we suggest that only $Ni(OH)_2$ existed on the surface, whereas NiO disappeared upon $TiO_2$ deposition. Both CO adsorption and CO oxidation took place on NiO/$Ni(OH)_2$ surfaces under our experimental conditions. CO adsorption was completely suppressed after $TiO_2$ deposition, whereas CO oxidation activity was maintained to large extent. It is proposed that bare NiO can uptake CO under our experimental condition, whereas hydroxylated surface of NiO can be active for CO oxidation.

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Effect of Substrate on Electroless Co-Base Deposited Films (무전해 코발트계 석출막에 미치는 기판의 영향)

  • Han, Chang-Suk;Chun, Chang-Hwan;Han, Seung-Oh
    • Korean Journal of Materials Research
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    • v.19 no.6
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    • pp.319-324
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    • 2009
  • The deposition behavior and structural and magnetic properties of electroless Co-B and Co-Fe-B deposits, as well as the amorphous ribbon substrates, were investigated. These Co-based alloy deposits exhibited characteristic polycrystalline structures and surface morphology and magnetic properties that were dependent on the type of amorphous substrates. The catalytic activity sequence of the amorphous ribbon electrodes for anodic oxidation of DMAB was estimated from the current density-potential curve in the anodic partial electrolytic bath that did not contain the metal ions. Both the deposition rate and potential in the initial region were obtained in order of the catalytic activity, depending on the alloy compositions of the substrates. The deposition rate linearly varied against the deposition time. The initial deposition potential may have also determined the structural and magnetic properties of the deposit based on the thickness of ${\mu}m$ order. Furthermore, a basic study of the electroless deposition processes on an amorphous ribbon substrate has been carried out in connection with the structural and magnetic properties of the deposits.

Progress in the co-evaporation technologies developed for high performance REBa2Cu3O7-δ films and coated conductors

  • Lee, J.W.;Yoo, S.I.
    • Progress in Superconductivity and Cryogenics
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    • v.14 no.4
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    • pp.5-11
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    • 2012
  • In this review article, we focus on various co-evaporation technologies developed for the fabrication of high performance $REBa_2Cu_3O_{7-{\delta}}$ (RE: Y and Rare earth elements, REBCO) superconducting films. Compared with other manufacturing technologies for REBCO films such as sputtering, pulsed laser deposition (PLD), metal-organic deposition (MOD), and metal organic chemical vapor deposition (MOCVD), the co-evaporation method has a strong advantage of higher deposition rate because metal sources can be used as precursor materials. After the first attempt to produce REBCO films by the co-evaporation method in 1987, various co-evaporation technologies for high performance REBCO films have been developed during last several decades. The key points of each co-evaporation technology are reviewed in this article, which enables us to have a good insight into a new high throughput process, called as a Reactive Co-Evaporation by Deposition and Reaction (RCE-DR).