Energy Losses Analysis of Fe-based and CoFe-based Soft Ferromagnetic Wires

Yinfeng Li, Peng Liu, Suqin Feng, Peiying Chen


The CoFe-based amorphous and Fe-based nanocrystalline alloys possess excellent soft magnetic properties due to their nearly zero-magnetostriction and very low magnetic anisotropy. So they are good candidate materials for power electronics and giant magneto-impedance (GMI) sensor applications. As an indication of their AC performance, energy losses were determined by the measurements of impedance for Co68.2Fe4.3Si12.5B15 amorphous wire and Fe73.5Cu1Nb3Si13.5B9 nanocrystalline wires with different domain structure. The measurements were carried out at a frequency range of 10 – 104 Hz and induction amplitudes of 0.1 – 1.2 T. Although the measured results show good agreement with the scale theory model of energy loss, different origins of energy loss in the investigated samples have been concluded by comparing the experimental data with the Bertotti’s statistical model. The differences of energy loss in these samples could be explained by considering the magnetic structure and circular technical magnetization processes.


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