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Sputter-texttured Mo 박막이 CoCrTa/Cr 자기기록매체의 자기적 성질에 미치는 영향
조성묵,남인탁 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.A
The effect of Mo underlayer on the magnetic properties of CoCrTa/Cr films deposited on glass substrates were investigated. The coercivity increased and the coercivity squareness decreased by introducing Mo underlayer. The coercivity increase was attributed to the increase of in-plane c-axis orientation and magnetic isolation of Co grains deposited on Cr/Mo underlayer. The decrease of coercivity squarenesses seemed to be caused by the increase of magnetic isolation. The increase of magnetic isolation of Co grains was attributed to the diffusion of Mo atoms into Brain boundaries of Co films and the physical isolation of Co grains. The coerciyity of CoCrTa/Cr/Mo showed maximum values at Mo thickness of 400Å. The appearance of the maximum coercivity at that thickness was attributed to the development of strong Co(10□ Θ) and Co(10□ 1) preferred orientation.
Sputter-texttured Mo 박막이 CoCrTa/Cr 자기기록매체의 자기적 성질에 미치는 영향
조성묵(Jo Sung Mook),남인탁(Nam In Tak) 강원대학교 산업기술연구소 2001 産業技術硏究 Vol.21 No.1
The effect of Mo underlayer on the magnetic properties of CoCrTa/Cr films deposited on glass substrates were investigated. The coercivity increased and the coercivity squareness decreased by introducing Mo underlayer. The coercivity increase was attributed to the increase of in-plane c-axis orientation and magnetic isolation of Co grains deposited on Cr/Mo underlayer. The decrease of coercivity squarenesses seemed to be caused by the increase of magnetic isolation. The increase of magnetic isolation of Co grains was attributed to the diffusion of Mo atoms into grain boundaries of Co films and the physical isolation of Co grains. The coercivity of CoCrTa/Cr/Mo showed maximum values at Mo thickness of 400Å. The appearance of the maximum coercivity at that thickness was attributed to the development of strong Co(1010) and Co(1011) preferred orientation.
남인탁,김동현,조성묵 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-
본 연구에서는 RF/DC 마그네트론 스퍼터링 시스템을 이용 실리카(SiO₂) 박막을 제조하였다. 상온과 250℃의 기판온도에서 O₂ 가스의 분압을 변화시키며 박막을 제조한 후 물리적, 화학적 특성들에 대하여 알아보았다. 250℃에서 증착한 시편의 경우에는 O₂의 유입량이 증가됨에 따라 박막의 증착속도가 증가하였으며, AFM를 이용해 표면을 살펴 본 결과 부드러운 표면이 관찰되었음을 알 수 있었다. 또한, 흘려주는 O₂ 가스의 양을 증가시키며 증착을 하였을 경우에 SiO₂의 피크의 높이와 결합에너지의 값이 증가되었음을 FT―IR 및 ESCA를 이용해 확인할 수 있었다. In this paper, we study the growth of silicon oxide(SiO₂) films. Silicon oxide film layers have been fabricated by RF/DC magnetron sputtering method and examine characteristics of the grown films. The composition of these layers fabricated at varying oxygen injections and substrate temperatures. While the oxygen injection and substrate temperature increased, the oxygen content in these film layers increased considerably. The ESCA and FT-IR analysis prove the silica(SiO₂) thin film layer. The deposition rate depend upon the O₂/Ar ratio and substrate temperature. The binding energy and intensity of Si-O-Si increased with O₂ flow. The results of the study can apply as basic study for development of high ability insulator.
흙의 립도분포(粒度分布)가 석회혼합토(石灰混合土)의 강도특성(强度特性)에 미치는 영향(影響)
조성정 ( Cho Seong Jeong ),강의묵 ( Kang Yea Mook ) 한국농공학회 1985 韓國農工學會誌 : 전원과 자원 Vol.27 No.2
The characteristics of compaction and unconfined compressive strength were investigated by mixing with lime to all soils adjusted by given percentages of two kinds of clays to sand to obtain the most effective distribution of grain size and the optimum lime content for soil stabilization. In addition, unconfined compressive strength and durability tested by adding of sodium metasilicate, sodium sulfate, sodium carbonate, sodium hydroxide and magnesium oxide to lime-soil mixture mixed with 8 percent lime to adjusted soil having the mixing percentage of 60 percent of cohesive black clay and 40 percent of sand by weight to get the effect and the optimum content of chemicals. The results obtained were as follows; 1. With the addition of more lime, the optimum moisture content was increased, and the maximum dry density was decreased, whereas the more the amount of clay and the less was the maximum dry density. 2. In the soil having more fine grain size the unconfined compressive strength was larger in the earlier stage of curing period, in accordance with the longer period, the mixing percentages of sand to clay showing the maximum unconfined compressive strength, on the basis of 28-day strength, were 60% : 40% (black clay) and 40% : 60% (brown clay) respectively. 3. The reason why the soil adjusted with black clay was remarkably bigger in the unconfined compressive strength than ones adjusted with brown clay for all specimen of lime-soil mixture was the difference in the kind of clay, the amount of chemical compositions the value of pH. Black clay was mainly composed of halloysite that reacted with lime satisfactorily, whereas the main composition of brown clay was kaolinite that was less effect in the enhance of unconfined compressive strength. Also the difference of unconfined compressive strength was because black clay was larger in the amount of composition of calcium oxide and magnesium oxide in the value of pH affecting directly on the unconfined compressive strength of lime-soil mixture than brown clay. 4. In the lime-soil mixture mixed with 8 percent of lime to soil that mixing percentage of sand to black clay was 60% : 40%, on the standard of 7-day strength, the effect of chemical was arranged in the order of magnesium oxide, sodium carbonate, sodium sulfate, sodium hydroxide and sodium metasilicate. 5. The optimum amount of chemical being applicable to the maximum unconfined compressive strength of lime-chemical-soil mixture was 1 percent by weight for air dry soil in the case of adding sodium carbonated and 0.75 percent on sodium hydroxide, the unconfined compressive strength was increased continuously with increase of the amount of chemical up to 2 percent of chemical content is the lime-chemical-soil mixture added sodium metasilicate, sodium sulfate and magnesium oxide. 6. It was considered that the chemical played and accelerant role of early revelation of strength because the rate of increase of unconfined compressive strength of all of lime-chemical-soil mixtures was largest on the 7-day cured specimen. 7. The effect of test on freezing and thawing after adding suitable amount of chemical on the lime-soil mixture mixed with 8 percent of lime to soil that mixing percentage of sand to black clay was 60% : 40% was arranged in the order of magnesium oxide, sodium carbonate, sodium sulfate, sodium metasilicate and sodium hydroxide.