Depinning field of domain walls with a misaligned grain boundary in iron-based soft magnets

Abstract

We report on the domain wall (DW) depinning in an iron-based soft magnet with a misaligned grain boundary (GB) using micromagnetic simulations. The results show that the depinning magnetic field decreases with increasing roughness of the misaligned GB. This effect can be explained from the ratio of the overlapping areas of the GB to the DW when the DW is depinned from the GB. The results presented here offer a promising route to the design of soft magnets to decrease coercive force.