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Research was conducted to examine the dependence of the ferrimagnetic resonance linewidth on sintering conditions in manganese ferrite. The measurement of ferrimagnetic resonance linewidth of manganese ferrites, Mn1.0Fe2.0O4, was performed at 8.9 GHz from 77 to 320 K. The composition of the single crystal was confirmed using inductively coupled plasma spectrometry and preparation was performed using the floating zone method. The relaxation mechanisms that led to linewidth broadening and the different activation energies of each process were identified.

Research into the magnetic aftereffect and electrical conductivity of Ba2FeMoO6 is discussed. It was established that the magnetic aftereffect spectra indicate two clearly defined peaks connected with the magnetic phase transition and the orientational processes that can be fitted by activation energies close to 0.65 eV.

An interaction model is derived to analyze the magnetic relaxation of polycrystalline samples of BiPbSRCaCuO high-Tc superconductors. It is shown that effective energy increases with increasing temperature and decreasing magnetic field. This is attributed to the interactions among the vortices in the sample. Comparison of the model's results with those from the Anderson-Kim model also showed good agreement.

The ferromagnetic resonance (FMR) and the electrical conductivity in the perovskite sample, Sr(sub 2)FeMoO(sub 6), was analyzed. The FMR linewidth analysis has not only indicated the presence of Fe(super 2+) cation but has also shown data on the microstructure of the sintered polycrystalline sample finding the value of the porosity.