Magnetic properties of (Fe1-xNix)72B20Si4Nb4 (x=0.0-0.5) bulk metallic glasses

The effects of partial substitution of Fe by Ni in (Fe1-xNix)(72)B20Si4Nb4 (x=0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) bulk metallic glasses (BMGs) on their magnetic properties were studied. It is found that the saturation polarization decreases from 1.15 T to 0.69 T with increasing Ni content from x=0.0 to x=0.5; the Curie temperature reaches its maximum of 598 K for composition x=0.1, and is then followed by a quick decrease with higher Ni content. Moreover, the random anisotropy and mean field theory were developed to investigate the magnetic properties of these BMGs, and the variations of saturation polarization and Curie temperature were well explained by calculating the magnetic exchange stiffness constant A and the nearest neighbor transition-metal-pair exchange interactions J by using the model. (C) 2013 Elsevier By. All rights reserved.