Crystallographically textured Ba0.8La0.2Fe11.8-xCu0.2O19-delta hexaferrites with narrow FMR linewidth

摘要

M-type hexaferrites which exhibit strong uniaxial anisotropy field, are promising for the applications in self-biased microwave and millimeter wave (MMW) devices. Here we demonstrate crystallographically textured hexaferrites with narrow ferromagnetic resonance (FMR) linewidth synthesized by the conventional ceramic method. Meanwhile, the relationship between iron-deficiency content and microstructure, crystallographic, and magnetic properties are researched. These hexaferrites have strong remanence ratio of above 0.9 along c-axis. By fitting of Lorentzian function to absorption derivative, we probe detailedly into the zero-field FMR linewidth of Ba(0.8)La(0.2)Fe(11.8-x)Cu(0.2)O(19-delta )hexaferrites. When x equals 1.0, it indicates the narrowest FMR linewidth of 3240e, as compared with previous reports for crystallographically textured hexaferrites.