Abstract
The mechanism responsible for ultra-low iron loss in TiN-coated silicon steel sheet was clarified by electron microscope observation of the magnetic domain and the structure at the interface of the TiN film and single crystal of silicon steel, and by X-ray pole figure measurement. Marked domain refinement due to thin TiN film coating was accomplished, satisfying the coherency relationship of formula math between the TiN film and single crystal matrix, by applying a strong surface tension to the [100] Si-steel direction (elastic strain along only one axis). Fine transverse fringes were observed at the interface using a transmission electron microscope, and the elliptical shape of the {200} Si-steel pole peaks was detected by measuring the dual textures of X-ray pole figures.
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