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Synthetic antiferromagnet CoFe / Ru / CoFe / FeMn을 이용한 스핀 밸브 구조의 interlayer coupling field
김광윤(K. Y. Kim),신경호(K. H),김희중(Shin),장성호(H. J. Kim),강탁(S. H. Jang) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.5
Top synthetic spin valves with structure Ta/NiFe/CoFe/Cu/CoFe(P1)/Ru/CoFe(P2)/FeMn/Ta on Si (100) substrate with natural oxide were prepared by dc magnetron sputtering system. We have changed only the thickness in free layers and the thickness difference (Pl-P2) in two ferromagnetic layers separated by Ru. and investigated the effect of magnetic film thickness on interlayer coupling field in spin valve with synthetic antiferromagnet. According to the decrease of free layer thickness, interlayer coupling field was increased due to the magnetostatic coupling(orange peel coupling). In case of t_(P1)>t_(P2). interlayer coupling field agreed well with the modifed Neel model suggested in conventional spin valve structures by Kools et al. However, in case of t_(P1)>t_(P2), it was found that the interlayer coupling field was not explained by the Modified Neel Model and was confirmed the necessity of further remodeling. The dependence of Cu thickness on the interlayer coupling field was investigated and 10 Oe of interlayer coupling field was obtained when the Cu thickness is 32 Å.
합성형 반강자성체인 CoFe / Ru / CoFe / FeMn에서 고정층의 두께 차이에 따른 스핀 밸브 구조의 자기저항 특성
김광윤(K. Y. Kim) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.5
Top synthetic spin valves with structure Ta/ NiFe/CoFe/Cu/CoFe(P1)/Ru/CoFe(P2)/FeMn/Ta on Si (100) substrate with SiO₂ of 1500 Å were prepared by dc magnetron sputtering system. We have changed only the thickness of the free layer and the thickness difference (P1-P2) in the two ferromagnetic layers separated by Ru, and investigated the effect of magnetic film thickness on the GMR properties and the interlayer coupling field in a spin valve with a synthetic anti ferromagnet. As thickness difference of pinned layer was decreased from +25 Å to -25 Å, MR ratio was decreased gradually. However, there was a dip zone indicating a big change of MR ratio around P1 = P2, which can be due to the large canting of pinned layers. The modified Neel model was suggested for the top synthetic spin valve to explain the interlayer coupling field according to the thickness change of ferromagnetic layers. The interlayer coupling field was decreased due to the magnetostatic coupling (orange peel coupling) as suggested by model. However, the interlayer coupling field was not explained at the dip zone by the modified Neel model. The deviation of modified Neel model at the dip zone could be due to the largely canting of the pinned layers as well, which depends on different thickness in synthetic anti ferromagnetic structure.
스파터링 조건이 FeMn계 top 스핀 밸브의 exchange bias 및 자기적 특성에 미치는 영향
김광윤(K. Y. Kim),신경호(K. S. Shin),한석희(S. H. Han),임상호(S. H. Lim),김희중(H. J. Kim),장성호(S.H. Jang),강탁(T. Kang) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.2
Top spin valve samples with a structure Ta/NiFe/CoFe/Cu/CoFe/FeMn/Ta were deposited on a Si(100) substrate by changing d.c. magnetron sputtering conditions and the exchange-bias and magnetic properties of samples were investigated. The Exchange field, Hex increased with increase of sputtering power of FeMn from 30 to 150 W and CoFe from 30 to 100 W deposited on the Cu, the increase of Hex was found due to the improvement of preferred orientation of (111) FeMn phase from XRD results. In the case of Cu, Hex decreased with the increase of sputtering pressure ranging from 1 to 5 mTorr. The relationship between exchange field and resistance was investigated, spin valve samples with a large exchange field showed the lower resistance, which was strongly dependent on the good crystallinity and grain size increase as well as lower scattering effects. The Cu thickness was changed from 22 to 38 Å for Si/Ta/NiFe/CoFe/Cu(t), 30 W/CoFe, 100 W/FeMn, 100 W/Ta spin valve structures, MR ratio of 6.5 % and exchange field of about 190 Oe were obtained for the sample with Cu of 22 Å thickness. The increase of exchange field with decrease of Cu thickness was explained by FM/AFM spin-spin interaction.