Abstract
Ferrimagnetic resonance linewidth of manganese ferrites, Mn1.0Fe2.0O4 has been measured at 8.9 GHz from 77 to 320 K. Single crystal was prepared by floating zone technique and their composition confirmed by inductively coupled plasma spectrometry. Polycrystalline samples were sintered under different conditions of temperature, time, and atmosphere. Eddy current and valence exchange contributions according to Sparks’ theory and a new procedure for evaluating superficial and porosity mechanisms are taken into account to analyze the ferrimagnetic resonance linewidth. Different contributions are present depending on sintering conditions: valence exchange mechanism appears only in samples sintered under low temperatures and high pressures; conductivity decreases for samples sintered at high pressures; porosity is highly raised up when sintering time decreases. Resonance fields, obtained from experimental data, are used to calculate anisotropy fields for polycrystalline samples.
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