Size Effect of Hard Magnetic Properties of Fe-Nb-B-Tb Milled Alloys
K. Granek, G. Ziółkowski, A. Chrobak, J. Klimontko and E. Talik
Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
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The paper refers to magnetic and structural properties of powders made of Fe-Nb-B-Tb ultra-high coercive alloy. The initial alloy was milled in a low energy mill for 1 h and 14 h. With increasing milling time we observed gradual deterioration of hard magnetic properties i.e. the coercive field decreases from 5.51 T to 0.14 T for the bulk alloy and 14 h milled powder, respectively. However, for the 1 h milling time the micrometric powder reveals quite high coercivity of 2.77 T which is promising for possible applications in magnetic composites.

DOI: 10.12693/APhysPolA.133.645
PACS numbers: 81.07.Bc, 75.50.Tt, 75.60.d, 76.80.+y