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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/68059
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