In my presentation, I will introduce the relation between grain alignment and coercive force decrease ratio. This experimental result shows that it is difficult to explain this phenomena by the coherent rotation of magnetism (Stoner-Wohlfarth model) and it qualitatively explains by the domain wall motion model followed by the 1/cosθ law.
From this consideration and conclusion, two questions generate. One is whether the domain walls or the reverse domains exist in lower magnetic field than coercive force or not and the other question is whether the curve of the coercive force decrease ratio could quantitatively explain by the 1/cosθ law taken into account the alignment distribution function or not. I will introduce the recoil curve measurement and the calculation results of the coercive force decrease ratio using the alignment distribution function measured by EBSD.