Hysteresis loss reduction in self-bias FeSi/SrFe₁₂O₁₉ soft magnetic composites

The magnetic field provided by magnetized SrFe₁₂O₁₉ particles in FeSi/SrFe₁₂O₁₉ composites is used to replace the applied transverse magnetic field, which successfully reduces the magnetic loss of the composites with minor reduction of permeability. This magnetic loss reduction mainly comes from the decrease in hysteresis loss, while the eddy current loss is basically unaffected. The hysteresis loss reduction in magnetized composites is believed to be due to the decrease in domain wall displacement caused by the increase in the average magnetic domain size in a DC magnetic field. This is an effective method for reducing the magnetic loss of soft magnetic composites with wide application potential, and there is no problem of increasing the cost and the volume of the magnetic cores.