Abstract
Abstract Although the microstructure and magnetic tomography images of an advanced Nd-Fe-B sintered magnet were previously reported [Takeuchi, SO., NPG Asia Mater. 14, 70 (2022)], the relationship between these three-dimensional images has not been well analyzed. In this work, a feature extraction method of histogram of oriented gradients and a classification method of uniform manifold approximation and projection are employed for this issue. The microstructural features with superimposing the information of magnetic domain structure are classified into two groups depending on the external magnetic field, resulting in the different microstructural features for the different magnetization states are successfully classified. These differences of the microstructural features are difficult to be found by human recognition. Further detailed analysis of these microstructural features may clarify the key microstructures for the nucleation of reversed domains and their propagations.
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