| Isotropic epoxy-resin bonded magnets composed of a mixture of Magnequench MQP-B and strontium ferrite or alnico powders have been prepared using a compression moulding technique. The magnetic measurements have been performed using the vibrating sample magnetometer in a magnetic field up to 14 T. From the analysis of the differential susceptibility versus an internal field it was deduced that the main mechanism of magnetization reversal process in MQP-B and MQP-B with strontium ferrite magnets is the pinning of domain walls at the grains boundaries of the MQP-B component. For MQP-B magnet with alnico, the rotation of the magnetization vector in alnico grains plays an important role in magnetization reversal process. The interaction between the magnets particles was examined by use of the so-called dM(Hi) plot. The negative values of dM in all range of applied fields prove that the interaction between the magnet particles is the long-range magnetostatic one, except for the sample with ferrite for which the dM remains positive for an applied field less than 1.1 T. |
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