Abstract
Soft magnetic materials are at the core of electromagnetic devices. Planar transformers are essential pieces of equipment working at high frequency. Usually, their magnetic core is made of various types of ferrites or iron-based alloys. An upcoming alternative might be the replacement the ferrites with FINEMET-type alloys, of nominal composition of Fe73.5Si13.5B9Cu3Nb1 (at. %). FINEMET is a nanocrystalline material exhibiting excellent magnetic properties at high frequencies, a soft magnetic alloy that has been in the focus of interest in the last years thanks to its high saturation magnetization, high permeability, and low core loss. Here, we present and discuss the measured and modelled properties of this material. Owing to the limits of the experimental set-up, an estimate of the total magnetic losses within this magnetic material is made, for values greater than the measurement limits of the magnetic flux density and frequency, with reasonable results for potential applications of FINMET-type alloys and thin films in high frequency planar transformer cores.
Highlights
Academic Editors: Joan-Josep Suñol and Francisca G
Soft magnetic materials are an essential part of electromagnetic devices, in bulk or as thin films [1,2,3,4]
Temperature is one important parameter that influences the magnetic behaviour of a material, by modifying its magnetic properties: a nonlinear evolution of magnetic parameters as function of temperature exists [38,39,40,41,42,43]
Summary
Academic Editors: Joan-Josep Suñol and Francisca G. Soft magnetic materials are an essential part of electromagnetic devices, in bulk or as thin films [1,2,3,4]. Current technology in high frequency switching planar transformers involves the use of soft ferrites, for the core, with various chemical composition [9,10,11]. This class of ceramic materials fulfil the main requirements, such as high saturation flux density, high permeability (even for kHz frequencies), and low core losses. The ferrite cores have a typical efficiency of up to 97–99%, which offers a great heat dissipation [12]
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