Magnetization reversal processes in bonded magnets made from a mixture of Nd-(Fe,Co)-B and strontium ferrite powders

► SrFe12O19 addition causes a decrease in the Hc, JR and (BH)max. ► Hc and JR changes are not in agreement with dilution law. ► Main mechanism of the coercivity is the pinning of domain walls. ► In both magnets from pure powders dominant role plays long range dipolar interactions. ► Dipolar and exchange interaction are simultaneously present in hybrids but the dipolar are weaker.