We analyze the physical mechanisms associated with addition of CoO to sintered Mn-Zn ferrites and the ensuing stabilization versus temperature of their magnetic properties. We determine, in particular, the value and behavior of the magnetic anisotropy as a function of doping and temperature and we model in physical terms the evolution of the energy loss in the investigated frequency (DC - 1 GHz) and temperature (20 degrees C - +130 degrees C) ranges. We show that magnetic aging by long exposure of the CoO-doped ferrites at 200 degrees C is minimized by additional TiO2 doping. This is observed to restrain the increase of the extra-anisotropy induced by directional ordering of the Co2+ cations.
Measuring and modeling broadband magnetic losses versus temperature and aging effects in CoO-doped Mn-Zn ferrites / Tsakaloudi, V; Beatrice, C; Dobak, S; Fiorillo, F; Zaspalis, V. - (2020), pp. 1454-1458.
Measuring and modeling broadband magnetic losses versus temperature and aging effects in CoO-doped Mn-Zn ferrites
Beatrice, C;Fiorillo, F;
2020
Abstract
We analyze the physical mechanisms associated with addition of CoO to sintered Mn-Zn ferrites and the ensuing stabilization versus temperature of their magnetic properties. We determine, in particular, the value and behavior of the magnetic anisotropy as a function of doping and temperature and we model in physical terms the evolution of the energy loss in the investigated frequency (DC - 1 GHz) and temperature (20 degrees C - +130 degrees C) ranges. We show that magnetic aging by long exposure of the CoO-doped ferrites at 200 degrees C is minimized by additional TiO2 doping. This is observed to restrain the increase of the extra-anisotropy induced by directional ordering of the Co2+ cations.| File | Dimensione | Formato | |
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Proc. IEEE 29th Int. Symp. Ind. Electronics (ISIE), Delft, 2020_preprint.pdf
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