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Co / Cu인공초격자에서 저온 열처리가 자기저항에 미치는 영향
민경익(Kyeong-Ik Min),송용진(Yong-Jin Song),이후산(Hoo-San Lee),주승기(Seung-Ki Joo) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.4
Thermal stability of Co / Cu artificial superlattice (AS) prepared by RF-magnetron sputtering and the effect of low temperature annealing on the magnetoresistance of the AS have been investigated in this work. Dependence of annealing behavior on the Cu spacer thickness, Fe underlayer thickness, and kind of the underlayer was examined and the relationship between the interfacial reaction and magnetoresistance was studied. It turned out that when Co / Cu AS was annealed at low temperature (<450 ℃), the magnetoresistance could increase in the case of AS with thick spacer Cu (20~25 Å) layer, whereas it decreased in the case of AS with thin spacer Cu (7 Å) layer, which of the former is in contrast with previous reports and the latter in consistent with them. The increase of magnetoresistance is due to increase of interfacial atomic sharpness, which is supported by low angle X-ray diffraction analysis. The thermal stability of Co / Cu AS was better in the case of thick Fe underlayered AS. Interfacial reaction (separation of intermixed Co and Cu) could be observed at lower temperature for (200)-textured samples than for (111)-textured samples, which can be interpreted in terms of in terdiffusion kinetics depending on the crystallographic orientation.
NiFeCo / Cu / NiFeCo / FeMn 스핀밸브 구조의 자기저항 거동 해석
배성태(Seongtae Bae),김진영(Jin Young Kim),민경익(Kyeong-Ik Min),신경호(Kyung-Ho Shin) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.2
Magnetic and magnetoresistance behavior of NiFeCo /Cu /NiFeCo /FeMn spin valve multilayers prepared by sputtering has been investigated. Magnetoresistance of 6 % was obtained for a sample with 15 Å thick Cu interlayer. The exchange anisotropy field of a NiFeCo /FeMn spin valve was found to be very small, ~20 Oe, which is far smaller than that reported in NiFe /FeMn spin valves(> 100 Oe). The coercive field of a NiFeCo film deposited at 3 mTorr was ~10 Oe, which is far larger than that(~2 Oe) reported in NiFe films prepared under similar condition. Magnetoresistance curve exhibited an asymmetric magnetization reversal behavior presumably due to a small exchange anisotropy field and large coercive field.