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신경호(K. H. Shin) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
차량에 장착되는 그로멧은 내외부를 차단하여 수분 및 유분 유입을 방지하고 전선을 보호하는 기능을 가진 부품으로 차량 장착 시 작업자가 차체 경로에 따라 수작업으로 진행, 그로멧의 삽입력 및 이탈력 정도에 따라 업무상 근골격계 질환 및 불만 발생 요인이 된다. 본 연구에서는 비선형 해석과 실험계획법 기반인 다구찌 기법을 이용하여 저삽입력 및 고이탈력 특성치를 갖는 차량용 그로멧 형상 최적화 문제를 수행한다. 먼저 설계제약조건을 고려하여 상수인자인 그로멧의 씰 및 판넬 매칭부를 제외한 7 개부의 형상 설계 치수를 제어 인자로 설정하고 잡음 인자의 경우부품 특성을 고려하여 산포에 따라 부품 성능에 영향을 주는 인자로 제어할 수 없으나 실험 가능한 외부 윤활 정도인 마찰계수로 설정한다. 그리고 2 수준계 직교배열표를 배치하여 잡음 인자의 수준과 반복 실험을 통해 인자 별 각 특성치 조건에 맞는 최적 조건을 도출한다. 특성치의 경우 시험 평가 기준으로 음수가 아니고 작을수록 좋은 특성인 망소 정특성을 그로멧의 삽입력으로 설정하고 음수가 아니면서 클수록 좋은 특성인 망대 정특성을 이탈력으로 설정한다. 최종적으로 형상 설계 치수 최적 조합을 통해 저삽입력 및 고이탈력을 만족하는 그로멧의 형상 최적 모델을 수립하고 기본 모델과 비교 및 평가한다.
비정질 자성 합금의 조성에 따른 비대칭 자기 이력 곡선의 변화
신경호(K. H. Shin),민성혜(S. H. Min),이장로(J. R. Rhee) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.4
In order to investigate the origin of the asymmetric magnetization reversal effect, we studied the variation of magnetic hysteresis loops with the alloy composition in amorphous ferromagnetic alloy ribbons of (Fe_(1-x)Co_x)_(75)Si_(10)B_(15) system annealed at 380 ℃ for 16 hours in a zero field condition. The asymmetric magnetization reversal effect developed more strongly in amorphous ribbons having two metallic components than in ribbons having a single metallic component. The effect developed more strongly in ribbons showing a smaller value of the saturation magnetostriction. The development of the asymmetric magnetization reversal effect was affected by the ratio of two metallic components as well as the magnitude of the saturation magnetostriction.
열처리 온도와 시간에 따른 비대칭 자기 이력 곡선의 변화
신경호(K. H. Shin),민성혜(S. H. Min),이장로(J. R. Rhee) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.4
It has been reported that Co-based amorphous ferromagnetic alloys annealed in a small magnetic field develop a reproducible, asymmetric hysteresis loop. If the direction of the field during annealing is regarded as +, the magnetization reversal from - to + is smooth and reversible, with its slope determined by the demagnetizing field of the sample. This phenomenon is called the asymmetric magnetization reversal (AMR). The shape of the hysteresis loop depends sensitively on the condition during the anneal and the alloy composition. Here, we report on the effect of the annealing temperature and time on AMR in a zero magnetostrictive ferromagnetic amorphous alloy. The AMR effect develops in a very short time at a reasonably high temperature, but is stabilized by annealing for a prolonged time.
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.
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.