Visualization of magnetic domain structure in FeSi based high permeability steel plates by neutron imaging

•Combined visualization of magnetic domains/walls in high permeability electric steel.•Fringes observed with polarized neutron imaging, correlated to magnetic domains.•Magnetic domains oriented anti-parallel to each other with different magnetic fields.•Dark field imaging contrast helps the visualization of magnetic domain walls.•Also, the magnetic domains appear to be discontinuous at the grain boundaries.