Magnetic and structural properties of Ba M-type ferrite-composite powders

The goal of the work is to study the interparticle interactions, magnetic and structural properties of the M-type barium ferrite-composite powders BaFe8(Ti0.5Mn0.5)4O19 and BaFe8.5(Ti0.5Mn0.5)3.5O19 with packing densities ∼75%, embedded in synthetic rubber. The physical properties of the materials are investigated in a wide temperature range for their characterization and device adaptation down to a cryogenic environment. The development of the macromagnetic parameters, such as remanence, coercitivity, and squareness of the hysteresis loops, is observed upon change of the Fe composition. The interparticle interactions are estimated based on DC magnetic measurements. The dynamic magnetic properties of these composites are correlated to the dynamic characteristics of some disordered spin-glass-like materials