Calculation of Basic Domain Width Considering Lancet Domains in (110)[001]Fe3%Si

This paper presents the calculation method of basic domain width in demagnetized states of (110)[001]Fe3%Si under tensile stress in the range of lancet domain occurrence. Accurately calculating the 180 ^° basic domain width in demagnetized states is one of the important estimations to evaluate the anomalous eddy-current losses. Previously, stripe domain models, under sufficient strong tensile stress to annihilate lancet domains, were used so that the discrepancy between the calculated and the observed widths under tensile stress in which lancet domains occur became large. Applying the decrease of the surface magnetic charge by lancet domains to calculations of the stray field energy of basic domains enables us to accurately evaluate the 180 ^° basic domain width under tensile stress in demagnetized states. Furthermore, the eddy-current losses evaluated using the calculated basic domain width show good agreement with the measured values under the tensile stress in the range of lancet domain occurrence.