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3차 재결정에 의한 극박 방향성 규소강판의 결정립 크기와 자벽수와의 관계
김영학(Y. H. Kim),荒井賢一(K. I. Arai) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.3
The relationship between grain size and number of magnetic domain walls for tertiary recrystallized ultra thin 3% Si-Fe strips was investigated. It was found that the strips with different grain size can be produced by controlling the inserting speed of sample in annealing furnace. Though grain size of the stirip became smaller than 1㎜, B_8 of high value above 1.95T was obtained. But Hc increased with decaying the grain size. The magnetic domains and losses of the ultra thin grain oriented silicon steel with smaller grain size were observed. The eddy current losses of the strips were decreased with decreasing the grain size in high frequency range because strips with smaller grain have narrower magnetic domain wall spacings. But Hysteresis losses of the strips with smaller grain have high value in low frequency range. Therefore the iron loss of ultra thin grain oriented silicon steel could be controlled by the grain size. It was clarified that the minumum tatal loses depended on the exciting frequency and grain size.
김영학(Y. H. Kim),荒井賢一(K. I. Arai) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
This paper discussed on the observation of dynamic domain patterns using Lorentz SEM in the frequency region of 50 ㎐-10 ㎑. The observed dynamic domain patterns were compared with the simulated ones. The observation method is characterized by using the slight difference between the exciting frequency and the multiples of the scannning frequency of SEM.