Large Barkhausen Effect and Matteucci Effect in Amorphous Magnetostrictive Wires

The large Barkhausen effect and Matteucci effect generation mechanism in amorphous magnetostrictive wire were studied. It was found that induced magnetic anisotropy perpendicular to the surface of the as-prepared wire is changed into in-plane induced anisotropy along the direction of the tensile force by twisting the wire. Measurement of variation in Matteucci voltage e´p with twisting revealed that the magnetization vector changed from the irregular directions to a uniform direction along the twisting, indicating that e´p increases greatly with respect to twisting stress.