Abstract
The effect of continuous DC longitudinal magnetic field heat treatment on soft magnetic properties of Fe78Si9B13 amorphous cores was studied. The results showed that comparing with the amorphous cores without magnetic field heat treatment, the permeability increases and the coercivity decreases after the longitudinal magnetic field heat treatment. At the same time, the rectangular ratio Br/Bm of the amorphous cores increases from 0.58 to 0.94, and the rectangular hysteresis loop is obtained, the loss value of Ps the amorphous cores is significantly reduced at low frequency, while it is almost the same at the high frequency. At f=50Hz and Bm=1.3T, the loss value of Ps is 0.278W/kg in the heat treatment without magnetic field, and the loss value of Ps was 0.153W/kg in the longitudinal magnetic field heat treatment, which was 44.9% lower than that of heat treatment without magnetic field. The effect of structural relaxation on magnetic properties of the magnetic cores in longitudinal magnetic heat treatment is not significant, and the magnetic properties exhibit good stability.
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