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[FeNi / Cu / CoFe(Co) / Cu]N Spin - Valve 다층박막의 자기저항 특성
김미양(M. Y. Kim),이정미(J. M. Lee),최규리(K. L. Choi),오미영(M. Y. Oh),이장로(J. R. Rhee) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.1
Buffer/[NiFe/Cu/CoFe(Co)/Cu]_N spin-valve multilayers prepared by dc magnetron sputtering on a coming glass substrate using NiFe and CoFe(Co) possess different coercivities. Dependence of magnetoresistance on the type and thickness of buffer layer, thickness of Cu, NiFe, stacking number of multilayer, substrate temperature and annealing temperature in the form [NiFe/Cu/CoFe(Co)/Cu]_N spin-valve multilayers were investigated. To evaluate effect of magnetoresistance for this samples, X-ray diffraction analysis, vibrating sample magnetometer analysis, and magnetoresistance measurement (4-probe method) were performed. The maximum magnetoresistance ratio and coercivity were 7.5 % and 140 Oe, respectively for Cr-50Å/[NiFe-20Å/Cu-50Å/Co-20Å/Cu-50Å]_(10) at substrate temperature of 90 ℃. Magnetoresistance slope maintained 0.25% / Oe until 150 ℃ of annealing temperature, and then decreased to 0.03% / Oe at 200 ℃. It was confirmed that the main factor of thermal stability was deteriorating of soft magnetic properties in the NiFe layer.
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.
(NiFe / CoFe) / Cu / CoFe Spin - Valve 박막의 자기저항 특성
오미영(M. Y. Oh),이선영(S. Y. Lee),이정미(J. M. Lee),김미양(M. Y. Kim),이장로(J. R. Rhee) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.5
The MR ratios and the exchange biasing field and interlayer coupling field were investigated in Ni_(81)Fe_(19)/Co_(90)Fe_(10)/Cu_(90)Fe_(10) spin-valve sandwiches grown on anti ferromagnetic NiO films as a function of the NiO thickness, the thickness of Cu and pinning layer Co_(90)Fe_(10). The spin-valve sandwiches were deposited on the Corning glass 7059 by means of the 3-gun dc and 1-gun rf magnetron sputtering at a 5 mtorr partial Ar pressure and room temperature. The deposition field was 50 Oe. The MR curve was measured by the four-terminal method with applied magnetic field up to 500 Oe perpendicular to the direction of a current in the plane. The coercivity of magnetic soft bilayer [NiFe/CoFe] (90 Å) decreased dramatically to less than 10 Oe when the NiFe/CoFe bilayer used an NiFe bilayer thicker than 20 Å. SO NiFe layer improved the softmagnetic properties in the NiFe/CoFe bilayer. The GMR ratio and the magnetic field sensitivity of the spin-valve film Ni_(91)Fe_(19)(40 Å)/Co_(90)Fe_(10)(50 Å)/Cu(30 Å)/Co_(90)Fe_(10)(35 Å)/NiO(800 Å) was 6.3 % and about 0.5(%/Oe), respectively. The MR ratio had 5.3 % below an annealing temperature of 200℃ which slowly decreased to 3 % above 300℃. The large blocking temperature of the spin-valve film was taken (as being) due to the good stability of the NiO films. Thus, the spin-valve films with a free NiFe/CoFe layer clearly had a high large GMR output and showed a effective magnetic field sensitivity for a suitable spinvalve head material.