A multipurpose scanning apparatus for automatic analyses of soft magnetic materials and circuits (abstract)

Proper techniques for simultaneous evaluation of both global properties of magnetic circuits and local magnetic parameters of single grains or domains are an important prerequisite for optimal application and future improvement of ferromagnetic materials. The paper presents a test equipment designed to accommodate magnetic circuits up to outer dimensions of about 1 m×1 m×0.5 m. The box is thermally isolated for most sensitive thermistor applications such as local loss measurements. By means of a stepper‐motor‐driven sensing head which can pick up one or more sensors simultaneously, the scanning resolution and area can be freely chosen in a wide range from minimum scanning width of 10 μm to a maximum area of about 0.9 m×0.9 m. Geometrically highly resolving Hall sensors have been prepared for normal stray field analysis, thus visualizing local domain configurations.1 Tangential Hall sensors and differential field plates can be mounted for field measurements during magnetization process. Optionally, all sen...