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비정질 연자성재료를 이용한 복층 차폐체의 저주파 자기장 차폐효과
김성규(S. G. Kim),허진(J. Hur),박포규(P. G. Park),정연춘(Y. C. Chung),김윤배(Y. B. Kim),김택기(T. K. Kim) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.6
Magnetic shielding effect of cylinderical shields made of commercial amorphous ribbons has been studied. The shell-arragement-order of double shell shield has been found to show a striking difference in shielding factor. In low applied field region, a 2605CO-2705M-shield (outer shell: 2605CO, inner shell: 2705M) yields two times higher shielding factor than a 2705M-2605CO-shield (outer shell: 2705M, inner shell: 2605CO). The reasons are as follows: In case of 2605CO-2705M-shield, the outer shell is not easily saturated and effectively shields the applied field. In addition, the inner shell shows high shielding factor in the field shielded by the outer shell. In case of 2705M-2605CO-shield, the outer shell is saturated at very low field as well as the inner shell shows low shielding factor in the field shielded by the outer shell.
이단 냉각열처리에 의한 Co계 비정질 합금의 연자기 특성 향상
양재호(J. H. Yang),김만중(M. J. Kim),정연춘(Y. C. Chung),김윤배(Y. B. Kim),김택기(T. K. Kim) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.1
The soft magnetic properties of Co-based amorphous alloy have been studied as a function of cooling condition after annealing. The F&W treatment(furnace cooling to 250 ℃ then water quenching) could increase 60~100 % more the initial permeability than those of furnace cooled or water quenched alloys. These results are investigated in terms of thermal stress and ordering of magnetic ion pairs.