Total power loss density in a soft magnetic 49% Co–49% Fe–2% V-alloy

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The total power loss density of a soft magnetic alloy with wt. % 49 Co–49 Fe–2 V was investigated. Measured loss data of strip material with thickness 0.1 mm were in good agreement with the statistical loss theory that is based on separation of losses into hysteresis, eddy current, and excess contributions. As a standard reference material a low-loss 2.7 wt. % Si–Fe nonoriented electrical steel (with P = 2.25 W/kg at 1.5 T and 50 Hz at thickness 0.35 mm) was also investigated. The results indicate that the amount of excess loss is distinctly higher for the SiFe electrical steel while hysteresis loss is slightly lower. As a consequence the total loss density is lower for the CoFe alloy above a limit value of frequency that is identified for material thicknesses 0.1 mm, 0.2 mm, and 0.35 mm at several induction values. This result makes the material attractive for an increasing number of applications where energy efficiency is important. Kerr-microscopic images of the magnetic domain structure of the two materials show smaller domains of the CoFe alloy as the potential reason for the difference in excess losses.