This article presents an application of a miniature orthogonal fluxgate magnetometer to magnetic domain imaging of coated grain-oriented silicon steels. The method is based on a common technique which maps stray magnetic fields emerging from the surface of the silicon steel. An orthogonal fluxgate made of a thin amorphous wire core is bent in a J-shape so that it may work as a gradiometer, in which the longer leg of the J-shaped wire core is made sensitive to stray magnetic fields whereas the shorter one is effectively located at a distance from them. Experiments were carried out with a thin Co-based amorphous wire used as a wire core and a highly grain oriented silicon steel as a sample on which the domain refinement by laser irradiation is made. Well-defined stripe domains with some spike domains, and grain boundaries were clearly imaged with this method without any assisting magnetic field to enhance stray magnetic fields.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)