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NiFe / Cr 다층박막의 층수와 자기이방성에 따른 자기저항특성
황도근(D. G. Hwang),이상석(S. S. Lee),박창만(C. M. Park),이기암(K. A. Lee) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.3
Glass\Cr_(40Å)\[Cr_(10Å)\NiFe_(50Å)]_N multilayers (number of layer N = 1, 2, 3, 4, 5, 6, 10) were made by dc magnetron sputtering under magnetic anisotropy of 200 G. Magnetoresistance curve MR(xx), MR(xy) were measured for the parallel and perpendicular current direction to external magnetic field. MR(xx) curves for the number of layer N=1, 5, 10 were almost became about zero percent, however the curves of other numbers appeared the phenomena of positive magnetoresistance that the resistance increased to external magnetic field, and the irregular and reversed curves in the vicinity of H=0 Oe.
CoO가 삽입된 NiO스핀밸브의 자기저항특성 향상에 관한 연구
곽동호(D. H. Kwak),김종기(J. K. Kim),이기암(K. A. Lee),황도근(D. G. Hwang),이상석(S. S. Lee),J. Ginsztler(J. Ginsztler),현준원(J. W. Hyun) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.3
We inserted CoO layer in NiO spin-valves to improve on magnetoresistance and exchange coupling field. The magnetoresistance ratio was increased from 4.5 % to 5.5 % with the increase of CoO thickness. We can not find the dependence between (111) texture and exchange coupling by the measurement of XRD of CoO/NiO spin-valves. The surface roughness of CoO layer, 6.1 Å is twice more than that of NiO layer, 3.1 Å. The increase of exchange coupling field and coercive field in the CoO/NiO spin-valves will be due to increasing roughness. We prepared the NiO/CoO/NiO/CoO/NiO spin-valves to reduce coercive field and the coercive field decreased from 110 Oe to 50 Oe, and the coupling field is not changed from 70 Oe.