Microstructure and Electromagnetic Properties of La-Doped SrFe₁₂O₁₉/PPy Composite Synthesized by In-situ Composting

La-doped SrFe12O19 particles were prepared by absorbent cotton template method and then were used as raw material to prepare La-doped SrFe12O19/PPy composite by in-situ composting.The microstructure and electromagnetic properties of the composite were studied.The results show that La-doped SrFe12O19/PPy composite was a kind of aligned spherical aggregates,La-doped SrFe12O19 particles in the system were uniformly dispersed,and the PPy on the surface of La-doped SrFe12O19 was coated very closely.Magnetic properties of La-doped SrFe12O19/PPy composite appeared nonlinear reduced with the decrease of La-doped SrFe12O19 content.