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자장중 열처리에 의한 Nd₂Fe₁₄B / Fe₃B 초미세립 복합자성상의 자기특성 향상
박언병(Eon Byeong Park),양충진(Choong Jin Yang) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.2
An externally applied magnetic field during annealing the Nd₂Fe₁₄B/Fe₃B based spring magnet was found to enhance the exchange coupling between the hard and soft magnetic grains. More than 30 % increase in remanence values for melt-spun Nd₄Fe_(73.5)Co₃(Hf_(1-x)-Ga_x)B_(18.5)(x=0, 0.5, 1.0) alloys was resulted from uniform distribution of Fe₃B, α-Fe as well as Nd₂Fe₁₄B, and also from reduced grain size of those phases by 20 %. The result also showed that there is an optimum grain size exhibiting a high coercivity value which will be discussed in terms of previously simulated exchange coupling parameter.