발간논문

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Vol.32, No.11, 1323 ~ 1331, 1994
Title
The composition Dependence and Annealing Effect on the Giant Magnetoresistance of Co - Cu granular Films
박주욱Joo Wook Park, 주승기Seung Ki Joo, 고이홍의K . Takanashi, 관원귀언T . Sugawara, 등삼계안H . Fujimori
Abstract
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.
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