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후방산란법(RBS) / 양성자 여기 X-선 방출법(PIXE)을 이용한 다층자성박막의 두께 및 조성 정량분석
김태곤(T. G. Kim),전기영(G. Y. Jeon),황정남(C. N. Whang),신유하(Y. H. Shin),김영만(Y. M. Kim),송종한(J. H. Song),장성호(S. H. Jang),김광윤(K. Y. Kim) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.6
A spin valve structure of Ta/NiFe/CoFe/Cu/CoFe/Ru/CoFe/FeMn/Ta which has a synthetic antiferromagnet (CoFe/Ru/CoFe), was fabricated by using a magnetron sputtering system. The thickness and composition of magnetic free and pinned layers affect the magnetic properties such as exchange interaction strength of each layer and so on. Even though Rutherford Backscattering Spectrometry (RBS) has advantages of quantitative and non-destructive analysis, it is almost impossible to determine the thickness and composition of magnetic thin films using RBS because of its poor mass resolution for a higher atom number (Z>20). In this study, quantitative analysis of the element composition and thickness for the spin valve sample was performed by combining both Proton Induced X-ray Emission Spectrometry (PIXE), which is one of element specific analysis techniques, and grazing-exit RES with a highly improved depth resolution and absolute quantitative analysis. For the quantitative analysis, standardization of PIXE was carried out with NiFe, CoFe, and FeMn layers, which are one of constituent layers of spin valve films. Through PIXE standardization and the aid of PIXE experimental results of the spin valve sample, the overlapped signal in a grazing-exit RBS spectrum were successfully resolved and the thickness of the Ru layer was determined with a resolution of ~1 Å.
김현수(H.S. Kim),한병윤(B.Y. Han),이일천(I.C. Lee),김영만(Y.M. Kim),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.2
Design of the cooling channels of a plastic injection mold affects the quality and the productivity of the injection processes. In the injection process, the melted resin with high temperature enters the mold cavity, and just after the cavity is filled the heat should be dissipated through the cooling channels simultaneously. The purpose of this study is to analyse the heat transfer phenomenon and to estimate the temperature distribution in the mold to evaluate the cooling effect of the channels. The injection mold is assumed to have cooling channels of circular cross section and each channel has the same coolant flow rate. and The cavity has a rectangular shape. The results show that as the cooling channels get closer to the cavity surface, the cooling efficiency increases as might easily be guessed. However, due to the final hot resin flow from the gate an intensive cooling is required in that region.
김현수(H.S. Kim),한병윤(B.Y. Han),이일천(I.C. Lee),김영만(Y.M. Kim),박형구(H.K. Park) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
Design of the cooling channels of a plastic injection mold effects the quality and productivity of the injection processes. In the injection process the melted resin with high temperature enter the mold cavity and just after the cavity is filled the heat should be dissipated through the cooling channels simultaneously. The purpose of this study is to analyse the heat transfer phenomenon and to evaluate the temperature distribution in the mold to evaluate the cooling effect of cooling channels. The injection mold has 4 cooling channels of circular cross section and each channel has the same coolant flow rate, and the cavity has the rectangular shape. The results show that as the cooling channels get closer to the cavity surface, the cooling efficiency increases as might easily guessed.
김현수(H.S. Kim),정휘권(H.K. Jung),한병윤(B.Y. Han),김영만(Y.M. Kim),박형구(H.K. Park) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.3
The injection molding process is suitable for manufacturing complicated plastic products. As the customer request higher quality products increase, realization of the precise dimensional and shape controls is getting more important. For this purpose it is important to obtain uniform cooling procedure over the whole surface of the high temperature molded plastic. Failure to this may lead to different shrinkage speed, internal stresses and unwanted shape deformations. It is necessary to distribute coolant flow rates to the main channel and to the sub-channels properly to insure uniform cooling process when there are parallel cooling channels. In this study, three-dimensional turbulent flow simulations for representative parallel cooling channels were performed. To insure the intended flow rate to each sub-channels, various shape designs for the channel system were investigated. The results show that as the Reynolds number increases the effect of shape design is more profound. Through the proper flow distribution, uniform cooling effects would be expected.