Cation distribution and magnetic characteristics of textured BaFe12-Sc O19 hexaferrites: Experimental and theoretical evaluations

Abstract

Abstract Barium hexaferrites, which have been used to construct effective internal fields, have attracted tremendous research interest because of their potential applications in next-generation self-biased microwave and millimetre wave (MMW) devices. The lower-frequency application is currently limited by its usually strong magnetocrystalline anisotropy and large ferromagnetic resonance (FMR) linewidth. In this work, we study textured hexaferrites with excellent magnetic characteristics synthesized by the conventional ceramic method. This work uses the density-functional theory (DFT) calculations, Maxwell-Boltzmann statistical distribution, Rietveld refinements of the XRD data, and measurements of Raman spectra, to detect that scandium tends to occupy the 2a and 12k sublattices of textured hexaferrites. The zero-field FMR linewidth of textured hexaferrites is determined by the fitting of the Lorentzian function to the absorption derivative. These textured hexaferrites have a relatively narrower FMR linewidth of 482Oe than previous reports. We evaluate five critical molecular-field coefficients ωbf2, ωkf1, ωaf1, ωkf2, and ωbk of textured hexaferrites based on the Neel model of collinear-spin ferrimagnetism using nonlinear fitting methods, and the fitting results well coincide with the experimental results.