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Hysteresis behavior and microstructure of exchange coupled R2 Fe14B1/α-Fe magnets

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3 Author(s)
L. Withanawasam ; Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA ; A. S. Murthy ; G. C. Hadjipanayis

The hysteresis behavior of nanocomposite R2Fe14 B/α-Fe magnets with R=Nd and Pr was investigated at low temperatures. The room temperature coercivity depends on annealing with a peak value at 700°C. The low coercivity of samples annealed at temperatures below the optimum is due to incomplete transformation of R 3Fe62B14 to R2Fe14B phase. Hysteresis loops of Pr2Fe14B/α-Fe samples change from a smooth to a constricted loop when temperature is varied from 300 to 10 K. This may be due to the decoupling of a fraction of the larger 2:14:1 grains which reverse independently of the rest of the sample

Published in:

IEEE Transactions on Magnetics  (Volume:31 ,  Issue: 6 )