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Co-Cu 과립박막의 거대자기저항 현상에 대한 조성의존성과 열처리의 영향
주승기,박주욱,고이홍의,관원귀언,등삼계안 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.11
The composition and the annealing effect on the giant magnetoresistance of Co-Cu granular films fabricated by RF sputtering were investigated by TEM and NMR analysis. The maximum MR of 17% at 4.2K could be obtained at cobalt composition of 20 at%. From the TEM and NMR analysis, it has been found that the size of cobalt particles and the composition profile near the interfaces of cobalt particles are almost invariable with increase of cobalt concentration, while the interparticle distance decreases. Therefore, it could be concluded that the interparticle distance was mainly responsible for the existence of the maximum MR with respect to the cobalt composition in this system. According to the analysis of NMR spectrum, annealing of the films sharpened the composition profile of the interface between the cobalt particles and the copper matrix, which resulted in enhancement of the GMR values.
윤한기(Han Ki Yoon),이진경(Jin Kyung Lee),오정석(jung Seok Oh),손수정(Soo Jung Shon),H. Takanashi 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
This work is to scope potentiality of solid state bonding for SiC and W and to define key mechanism to make high temperature components satisfy their requirements. The preliminary result indicated the potential of the method as fabrication process of SiC and W high temperature system component. In this study, we investigate the microstructure mechanism, two types of reaction layer between W and SiC of interphase structure.