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김영석(Y.S.Kim),박기철(K.C.Park),김상주(S.J.Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Boundry element method for 2-dimsional potential problem was used to design of optimum blank shapes for irregular press forming. Material flow at blank holder was asuumed to potential flow. If blank is controlled only by blankhoder, blank shape for optimal drawing was found even though punch profile was complex.<br/> <br/>
퍼멀로이 박막의 보자력 및 실효투자율에 미치는 스퍼터링 조건의 영향
김현태(H. T. Kim),김상주(S. J. Kim),한석희(S. H. Han),김희중(H. J. Kim),강일구(I. K. Kang),김인응(I. E. Kim) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.3
Effects of sputtering conditions such as the input power, Ar pressure and substrate bias voltage, on the magnetic properties of permalloy(NiFe) thin films have been studied. The films were fabricated by using an RF magnetron sputtering apparatus. The coercive force is obtained to be low in the input power of 300~400W and the Ar pressure of 1~5mTorr. The best magnetic properties of the films achieved in this work are ; 0.10Oe for the coercive force and 2800(1 ㎒) for the effective permeability. The coercive force increases with increasing the substrate bias voltage at the low Ar pressure. The Ni content decreases with Ar pressure. The internal stress induced during sputtering is compressive at low Ar pressure but it changes to tensile at high Ar pressure, the stress-free state being at about 5 mTorr. The present result indicates that the variation of the soft magnetic properties with sputtering condition results mainly from the changes in the composition and internal stress.