The location of Barkhausen jumps and moving domain walls in magnetic laminations by means of electrodes in contact with the surface

Abstract

The voltage induced between surface contacts on a magnetic lamination when an elementary flux change occurs in the interior is calculated. It depends strongly on the depth of the source in the lamination as well as on the location of the probes. A technique for exploiting this dependence is suggested. Ratios of voltages induced between members of an array of six contacts, three on each side of the lamination, provide a sensitive indication of the location of the flux change source. The array may also be capable of distinguishing different types of domain wall in motion. © 1984.