Improvement of the magnetic properties of highly porous open-celled magnets

In the present study, we have investigated the influence of B2O3 addition on structural and magnetic properties of hard magnetic BaFe12O19 foams. In the presence of B2O3 open-celled foams were successfully fabricated at a calcination temperature of 1300 degrees C. Magnetization values have been improved by 50% with B2O3-addition. Remanence magnetization (M-R), specific magnetization at 1.5 T (M-S) and coercive field (H-c) values were obtained to be 32.7 emu/g, 63.0 emu/g and 2100 Oe, respectively for the 0.5 wt% B2O3 containing foams having 30 pores/in. Foams with these magnetic properties have the potential to be used in different areas of technology as permanently magnetic materials. (c) 2010 Elsevier Ltd. All rights reserved.