Magnetic Characterization in the Rayleigh Region of Nanocrystalline Magnetic Cores

Abstract

We report on the structural and magnetic characterization of two nanocrystalline Finemet-type magnetic cores. The nanocrystalline structure developed after annealing the amorphous precursor alloy at 550 °C for 30 and 60 min of annealing time. Structural analysis carried out by means of X-ray diffraction providing useful information on the grain size mean and partial volume of the nanocrystalline phase. The magnetic characterization was focused mainly in the Rayleigh region which, influenced by the intergranular coupling, was found to be more efficient in the sample treated for a longer time with a finer nanocrystalline structure.

Wide induction range analysis of DC magnetic properties and magnetization processes of Fe-based soft magnetic composites

“…The dependences of magnetic properties can be well approximated by the Rayleigh expressions. SMCs hence show a similar magnetization reversal behaviour in very low magnetic fields as already studied bulk crystalline or amorphous ferromagnets and soft ferrites [17][18][19][20][21].…”

“…Hence, many new applications of soft magnetic materials (e.g. low current transformers) include their use in the range of very low magnetic fields-the Rayleigh region [17][18][19][20]. Therefore the investigation of magnetization processes taking place in this induction range may provide valuable information since these processes are different compared to the processes at higher magnetic inductions.…”