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Acoustic Barkhausen Emission(ABE)and ElectromagneticBarkhausen Emission(EBE)have been measured.Explanations of the re-sponse of nickel to an applied magnetic field are considered using energydensity diagrams and critical fields deduced using Kersten’s modifiedtheory.These theoretical models are correlated with ABE and EBEmeasurements,providing further confirmation of the origins of ABE beingnon-180°domain wall motion.This paper also shows that the motion ofdomain walls,on increasing the magnetising fields from saturation to satu-ration,follows the sequence of 71°-180°-109°.Values of criticalfields correponding to 71°,180°and 109°wall motions in nickel are de-termined using these techniques.
Acoustic Barkhausen Emission (ABE) and Electromagnetic Barkhausen Emission (EBE) have been measured. Explanations of the re-sponse of nickel to an applied magnetic field are considered using energy density diagrams and critical fields deduced using Kersten’s modified theory. These theoretical models are correlated with ABE and EBEmeasurements, providing further confirmation of the origins of ABE beingnon-180 ° domain wall motion. This paper also shows that the motion ofdomain walls, on increasing the magnetising fields from saturation to satu ration, follows the sequence of 71 ° -180 ° - 109 ° .Values of criticalfields correponding to 71 °, 180 ° and 109 ° wall motions in nickel are de-termined using these techniques.