Studies on Characteristics of Barkhausen emission and evaluation of critical fields for domain wall motion in nickel

Acoustic Barkhausen Emission (ABE) and Electromagnetic Barkhausen Emission (EBE) have been measured. Explanations of the response of nickel to an applied magnetic field are considered, using energy density diagrams and critical fields deduced by using Kersten's modified theory. These theoretical models are correlated with ABE and EBE measurements, providing further confirmation of the origins of ABE being non-180° domain wall motion. This paper also shows that the motion of domain walls, on increasing the magnetising fields from saturation to saturation, follows the sequence of 71°-180°-109°. Values of critical fields corresponding to 71°, 180ånd 109°wall motions in nickel are determined using these techniques.