Application of Steinmetz Formula in M-Type Barium Ferrite

The AC magnetic parameters of the “softened” BaTi 1.2 Co 1.2 Fe 8.6 O 19-σ samples were measured using a B - H analyzer. As magnetic induction intensity amplitude B m increases, quality factor Q first decreases and then increases. The growth rate of magnetic loss power P cv is different in different B m intervals. According to Steinmetz formula, P cv ( B m ) relationships in different B m intervals were fitted, and Q ( B m ) relationships were derived; the change trend of Q with B m was semi-quantitatively explained. In different B m intervals, as B m increases, the growth rate of hysteresis loop area A is also different. The most intuitive manifestation is that the shape of the hysteresis loops has changed significantly. When B m is low, the shape is “elliptical,” and as B m increases, A increases faster. When B m is high, the shape of the loops gradually evolves into “S-shape.” The ends of the loops become sharp and curved, and the growth rate of A slows down. The variation trend of P cv with B m obtained from Steinmetz formula is consistent with the variation trend of hysteresis loop area and shape.