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Enhanced Exchange Coupling of Nd2Fe14B/Fe3B Magnet Via Magnetic Field Treatment |
Journal of Magnetics, Volume 1, Number 1, 30 Jun 1996, Pages 31-36 |
Choong Jin Yang(Electromagnetic Materials Lab., Research Institute of Industrial Science & Technology(RIST)), Con Byung Park(Electromagnetic Materials Lab., Research Institute of Industrial Science & Technology(RIST)) |
Abstract |
An externally applied magnetic field during heat treating 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 Mr/Ms values for melt-spun Nd4Fe73.5Co3(Hf1-xGax)B18.5(x=0, 0.5, 1) alloys was resulted from a uniform distribution of Fe3B, α-Fe and Nd2Fe14B phases, and also from a reduced grain size of those phases by 20%. The externally applied magnetic field induced a uniform distribution of fine grains. A study of Mossbauer effect also report that the enhancement of total magnetization of nanocomposite Nd2Fe14B/Fe3B alloys is attributed to an increased formation of Fe3B after magnetic annealing. |
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