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다층박막 Fe(50 Å) / [Co(17 Å) / Cu(24 Å)]20의 증착률 및 열처리가 자기저항에 미치는 효과
김미양(M. Y. Kim),최수정(S. J. Choi),최규리(K. L. Choi),송은영(E. Y. Shong),오미영(M. Y. Oh),이장로(J. R. Rhee),이상석(S. S. Lee),황도근(D. G. Hwang),박창만(C. M. Park),이기암(K. A. Lee) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.5
Dependence of magnetoresistance on base pressure and deposition rates of each Fe, Co, Cu layers in the Fe(50 Å)/[Co(17 Å)/Cu(24 Å)_(20) multilayer thin films, prepared by dc magnetron sputtering on Corning glass, were investigated. AFM analysis, X-ray diffraction analysis, vibrating sample magnetometer analysis, and magnetoresistance measurement (4-probe method) were performed. The multilayer films deposited under low base pressure increases magnetoresistance ratio by preventing oxidation. Annealing for the samples at a moderate temperature allowed larger textured grain with no loss in the periodicity. Magnetoresistance ratio of the annealed multilayers was increased due to the increase antiferromagnetically coupled fraction of the film after annealing. Optimization of deposition rate was greater than 1 Å/s for Fe, and 2.8 Å/s for Cu. Deposition rate of Co showed a tendency of increasing of magnetoresistance ratio due to the formation of flat magnetic layer in case of high deposition rate of Co.
정한,송은영,최규리,이용호,이장로,김미양,최수정 숙명여자대학교 자연과학연구소 1995 자연과학논문집 Vol.- No.6
We try to analysis comparing the measurements by wheat-stone bridge method at room temperature of the magnetoresistance (MR) measured with the current in the layer planes (CIP) and the current perpendicular to the layer planes (CPP) for the samples that we prepare equal and unequal thickness Ag/Co multilayers on glass substrates in a vacuum of ?? Torr by a thermal vacuum evaporation method. We try to consider the correlation between the magnetoresistance curve obtained from X-Y recorder and the magnetic hysteresis curve examined by vibrating sample magnetometer for the CIP and the CPP each other. The MR(H) curves are similar in shape for the CPP and CIP orientations, and also the magnetic fields, ?? in which MR peaks appear are nearly same for each orientation. Maximum MR dadas for the CIP and the CPP (CIP-MR, CPP-MR) with varing Ag thickness show the same variation, and unlike Fe/Cr or Co/Cu, the Ag/Co multilayers do not oscillate with Ag thickness. The CPP-MR appear from 1 times to 6 times as large as the CIP-MR for the same samples.