Mobility of the boundary between circular domains in stress annealed CoFeSiB amorphous wire

Abstract Dynamics of a single boundary (circular domain wall: CDW) between two circular domains was studied in stress annealed amorphous Co68.2Fe4.3Si12.5B15 wire. The experimental procedure, in which the displacement of the single CDW is measured after sending a pulse of a constant current, was proposed. The linear dependence of the velocity of the CDW versus circular field was observed. Eddy currents around a single CDW moving at constant velocity were calculated and a proportionality factor (CDW mobility) between velocity and circular field was derived. A good agreement between experimental and theoretical value of the CDW mobility was obtained.