Large Barkhausen Discontinuities and Their Propagation in Ni-Fe Alloys. II

The relationships between longitudinal field, intensity of magnetization and velocity of propagation of large Barkhausen discontinuities have been investigated. For a constant velocity of propagation a linear relation has been found between intensity of magnetization and longitudinal field. The curves relating velocity and intensity of magnetization for a fixed value of longitudinal field resemble velocity-longitudinal field curves. The relationships between longitudinal field, circular field and the directions of strain axes have been investigated for pure nickel wire under combined torsional and tensile stresses. It has been found that only the component of field in the direction of maximum compression affects the velocity of propagation. The behavior of propagation phenomena for pure nickel is just the reverse of that observed for a 10 percent Ni-Fe alloy. This difference is probably related in some way to the difference in magnetostrictive properties of the two wires.