• Journal of Magnetics
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• 제9권2호
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• pp.40-46
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• 2004

The magnetic properties of sputtered ($Ni_{83}Fe_{17}/Au/Co/Au$) multilayers with various thicknesses of Au (0.5 {\leq} t_{Au} {\leq} 3 nm), Ni-Fe ($1{\leq}t_{Ni-Fe}{\leq}4nm$) and Co ($0.2{\leq}t_{co}{\leq}1.5nm$) layers were characterized. An alternating in-plane and out-of-plane anisotropy of the ferromagnetic layers was achieved for the structures ($t_{Au}{\geq}1.5nm$) showing a weak coupling between the Ni-Fe layers with an in-plane anisotropy and the Co layers ($0.3{\leq}t_Co{\leq}1.2nm$) with a perpendicular anisotropy. For such a structure, a detailed discussion on the GMR effect is presented, relating to the magnetization reversal from a mutually perpendicular magnetic configuration at the remanence to a parallel one at the saturation. An influence of the dense labyrinth domain structure on the magnetoresistance effect is also addressed.

• 분석과학
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• 제8권4호
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• pp.591-596
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• 1995

Enzyme multilayers composed of avidin and biotin-labeled enzymes were prepared on the surface of electrode, through a strong affinity between avidin and biotin (binding constant: ca $10^{15} M^{-1}$). The enzyme multilayers were useful for the improvement of the performance characteristies of enzyme sensors. The output current of the enzyme sensors depended linearly on the number of enzyme layers deposited. Thus, lactate oxidase (LOx) and alcohol oxidase (AlOx) were deposited after being modified with biotin for constructing enzyme sensors sensitive to L-lactate and ethanol respectively. It was also possible to deposit two different kinds of enzymes successively in a single multilayer. The glucose oxidase (GOx) and ascorbate oxidase (AsOx) were built into a multilayer structure on a Platinum electrode. The GOx, AsOx multilayer-modified electrode was useful for the elimination of ascorbic acid interference of the glucose sensor.

• 한국추진공학회지
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• 제21권3호
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• pp.10-17
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• 2017

빠른 반응성 및 자체전파특성을 가지는 보론/티타늄 나노 다층박막구조를 대상으로 박막층 수평방향으로의 이종금속간 화학반응 및 화염 전파현상 해석 모델링을 수립하였다. 이종금속간 화학반응은 Arrhenius 반응식을 가정하여 모델링하였으며, 열 및 화학종 확산, 발열 화학반응에 따른 화염 자체전파 현상에 대하여 2차원적 전산해석을 수행하였다. 보론 및 티타늄 박막층의 두께 및 두께비 등 나노구조 형상의 영향을 비롯하여 접촉층 예혼합 정도가 화염 자체전파속도에 미치는 영향을 분석하였다.

• Journal of Magnetics
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• 제2권3호
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• pp.86-92
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• 1997

An artificially modulated magnetic Co/Pd multilayer is one of the promising candidates for high density magneto-optic (MO) recording media in the wavelength of a blue laser beam, due to large Kerr rotation angle. However, since the Co/Pd multilayer is a non-equilibrium state in terms of free energy and MO recording is a kind of thermal recording which is conducted around Curie temperature (Tc) of the recording media, the assessment of the thermal stability in the Co/Pd multilayer is crucially important both for basic research and applications. As the parameter of the thermal stability in this research, effective interdiffusion coefficients (Deff) perpendicular to the interface of the Co/Pd multilayers are measured in terms of Ar sputtering pressure and heat treatment temperature. From the results of the research, we find out that the magnetic exchange energy between Co and Pd sublayers strongly affects Deff of the Co/Pd multilayers. This discovery will provide the understanding of the magnetic exchange energy in the effective interdiffusion process of a magnetic multilayer structure and suggest the operating temperature range for MO recording in the Co/Pd multilayer for the basic research and applications, respectively.

• Macromolecular Research
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• 제16권4호
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• pp.373-378
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• 2008

A simple chemical fixation method for the fabrication of layer-by-layer (LbL) polyelectrolyte multilayer (PEM) has been developed to create a large area, highly uniform film for various applications. PEM of weak poly-electrolytes, i.e., polyallylamine hydrogen chloride (PAH) and poly(acrylic acid)(PAA), was assembled on polymer substrates such as poly(methyl methacrylate)(PMMA) and polycarbonate (PC). In the case of a weak polyelectrolyte, the fabricated thin film thickness of the polyelectrolyte multilayers was strongly dependent on the pH of the processing solution, which enabled the film thickness or optical properties to be controlled. On the other hand, the environmental stability for device application was poor. In this study, we utilized the chemical fixation method using glutaraldehyde (GA)-amine reaction in order to stabilize the polyelectrolyte multilayers. By simple treatment of GA on the PEM film, the inherent morphology was fixed and the adhesion and mechanical strength were improved. Both surface tension and FT-IR measurements supported the chemical cross-linking reaction. The surface property of the polyelectrolyte films was altered and converted from hydrophilic to hydrophobic by chemical modification. The possible application to antireflection coating on PMMA and PC was demonstrated.

• 한국추진공학회지
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• 제26권1호
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• pp.20-27
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• 2022

본 나노에너지 기술 해석연구에서는 알루미늄/니켈 나노 다층박막구조 내 이종금속 반응파의 박막층 수직방향 전파현상을 대상으로 모델링 및 해석을 진행하였다. Al/Ni층이 교차하는 반무한영역에서 열 및 화학종 확산 방정식을 기반으로 1차원적 전산해석을 수행하였다. 해석결과로 이종금속 반응파의 수직방향 정상 전파 확립 등 반응파 특성을 발견하였다. 수평방향 전파현상 해석과 비교하여 이와 같은 나노구조물에서 반응파 자체전파속도에 대한 방향성 변화 영향이 매우 약하게 나타남을 확인하였다.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 1997년도 춘계연구발표회 논문개요집
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• pp.26-27
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• 1997

• 한국자기학회:학술대회 개요집
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• 한국자기학회 1998년도 춘계연구발표회 논문개요집
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• pp.48-49
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• 1998

• 한국자기학회:학술대회 개요집
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• 한국자기학회 1998년도 춘계연구발표회 논문개요집
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• pp.32-33
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• 1998

• 한국자기학회:학술대회 개요집
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• 한국자기학회 1991년도 춘계연구발표회 논문개요집
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• pp.95-96
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• 1991