http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Synthetic antiferromagnet CoFe / Ru / CoFe / FeMn을 이용한 스핀 밸브 구조의 자기저항 특성
장성호(S.H. Jang),강탁(T. Kang),김민정(M.J. Kim),김희중(H.J. Kim),김광윤(K.Y. Kim) 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, and investigated on the magnetoresistance properties and effective exchange bias field. As the thickness of FeMn increased above 150 Å, MR ratio was decreased due to the current shunting effect. As the thickness of free layer decreased below 40Å, MR ratio was reduced rapidly. In case of 40 Å thick of free layer, spin valve film with a structure Si(100)/Ta(50 Å)/NiFe(27 Å)/CoFe(13 Å)/Cu(26 Å)/CoFe(30 Å)/Ru(7 Å)/CoFe(15 Å)/FeMn(100 Å)/Ta(50 Å) exhibited maximum MR ratio of 7.5 % and an effective exchange bias field of 600 Oe, respectively. Thickness difference dependence in this synthetic spin valve structure on effective exchange field was investigated and interpreted by the analytical method. It should be noted that thickness increase of CoFe(P1) and decrease of CoFe(P2) in synthetic antiferromagnet leaded to the decrease in effective exchange bias field by experimentally and analytically.
나노 옥사이드 층을 가진 스펙큘라 스핀밸브의 자기저항 특성 및 교환바이어스의 열처리 온도 의존성
장성호(S. H. Jang),강탁(T. Kang),김희중(H. J. Kim),김광윤(K. Y. Kim) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.3
We investigated magnetoresistance(MR) and exchange bias properties by annealing in top and bottom type spin valves (SV) with nano-oxide layers (NOL). In top SVs with NOL, MR ratio of 9.2 % is obtained after postdeposition annealing at 250 ℃. In bottom SVs with NOL, MR ratio of 10.1 % is obtained after postdeposition annealing at 250 ℃. Therefore, specular reflection of the NOL in bottom SVs is higher than that of the NOL in top SVs. Exchange biasing of bottom SVs with NOL is 28 % higher than that of bottom SVs without NOL after annealing. This enhancement of exchange biasing is thought to be due to the reduced magnetic moment of the pinned laver with NOL and enhanced (111) FeMn texture.
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.
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.