Abstract
Microwave absorption measurements were carried out on Ni 0.35Zn 0.65Fe 2O 4 polycrystalline ferrites, at a constant frequency of 9.4 GHz (X-Band) and dc magnetic fields ( H dc) in the 0–0.8 T range. The measuring temperature was varied from 300 to 500 K. A clear evolution from ferromagnetic resonance (FMR) to paramagnetic resonance (EPR) was observed as a function of temperature which is related with the passage through the Curie point (∼430 K), as observed by thermal variations of magnetic permeability. In addition, a low field ( H dc<0.06 T) absorption signal was observed with the same phase as the FMR absorption. However, in contrast with FMR, this signal exhibited hysteresis by cycling the dc field and disappears with temperature (∼350 K) before the Curie point is reached. The assignment of this signal as due to non-resonant microwave absorption processes by the partially magnetized sample is discussed.
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