DOMAIN-WALL PINNING IN NDFEB MELT-SPUN MAGNETS

Vanadium addition in melt-spun MQ2 magnets reduces the initial magneti c susceptibility. It also leads to a grain size decrease and to the fo rmation of rich vanadium precipitates. Lorentz microscopy observations show that these precipitates do not pin the domain walls. However, th is result could be attributed to the thinned state of the specimen. Fu rthermore, a similar experience is implemented with a Sm2Co17 slide. I n this case, a strong pinning effect is observed. In conclusion, the i nfluence of vanadium on magnetic characteristics can only be attribute d to the grain size reduction.