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Fe₃B+Nd₂Fe₁₄B spring magnet 분말 압분체의 Exchange Decoupling
한종수(Jong Soo Han),양충진(Choong Jin Yang),박언병(Eon Byung Park) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.5
Experimentally it is well known that the magnetic properties significantly deteriorate when nanocomposite bonded magnet are made from nanocomposite ribbon. A decrease in maximum energy product of Fe₃B+Nd₂Fe₁₄B nanocomposite from 14 MGOe in nanocomposite ribbon to 6.5 MGOe in powder compact was found to be general. Thus, the present study is focused on finding out the root of exchange decoupling of Fe₃B+Nd₂Fe₁₄B nanocomposite powder compacts. The exchange decoupling behavior of the powder compact of Fe₃B+Nd₂Fe₁₄B composition was studied by measuring DC demagnetization and isothermal remanent demagnetization curves, which are essential for plotting produced δM curve. From the δM plot the deterioration in the magnetic properties resulted from the fact that the magnetostatic interaction became dominant rather than the exchange interaction in powder compact. It is concluded that the demagnetization behavior governed by the dominant magnetostatic interaction reduced the remanence magnetization, which caused the reduction of maximum energy product of the powder compact. We also found that the elimination of residual stress which is unavoidably accumulated during grinding process enhanced the magnetic properties considerably.
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