An electrostatic self-assembly method for preparing La/Ce doped strontium ferrite nano-composite multi-layer thin film for possibly improving its absorption properties

The introduction of the full paper reviews Refs. 1 through 4 and then points out that, to our knowledge, there is no paper in the open literature on preparing film that possesses good absorption properties. Sections 1 and 2 explain our experimental work on preparing the thin film and on the determination of its properties. The first part of their core consists of: (1) we determine the substrate treatment method for the doped nano-strontium ferrite and PSS multilayer composite film and for monolayer film assembly time; (2) we use the UV-Vis, XRD, AFM and VSM to analyze the structure and properties of the thin film. The second part of the core concerns the experimental results, presented in Figs. 2 through 11, and their analysis; they show preliminarily that: (1) the thin films are amorphous; (2) their surfaces are composed of spherical grains; (3) their average grain size is about 150 nm. The final part of the core is concerned with the electromagnetic property analysis; the analysis results reveal that the absorption properties of SrLa_0.4Fe_11.6O₁₉/PSS improve with increasing number of multi-layer film layers and that at 9.21 GHz and 10.5 GHz, the microwave absorption properties of the SrCe_0.2Fe_11.8O₁₉/PSS multi-layer film are better than those of SrLa_0.2Fe_11.8O₁₉/PSS doped multi-layer film and of course much better than those of undoped SrFe₁₂O₁₉/PSS.