Analysis of Magnetic Domain Structure of Grain-Oriented Electrical Steels Using 2-D Fourier Transform

Grain-oriented electrical steels (GOESs) are the main components of transformers, which should have low energy losses and noise. Hence, GOESs should reduce iron loss and magnetostriction, which are determined by their magnetic domain structures. In particular, the angle and spacing of the 180° domain walls are important characteristics of the GOES domain structures. In this study, we propose a method to rapidly quantify the spacing and angle of the walls of 180° magnetic domains in GOESs. The proposed method considers the magnetic domain structure as a two-dimensional dataset. The spacing and angle of the wall of the 180° magnetic domain of the polycrystal are obtained separately by transforming the dataset into a spatial frequency domain using two-dimensional Fourier transformation. The results obtained using the proposed method agree well with the experimental results, demonstrating the effectiveness of the proposed method.