MAGNETIC BARKHAUSEN NOISE AT DIFFERENT MAGNETIZATION CONDITIONS
Alexandr Stupakov – Oleksiy Perevertov – Miroslav Neslušan
The magnetic Barkhausen noise (BN) is measured at controllable magnetization conditions: the triangular field and induc-tion waveforms. A special attention is paid to an unexplored topic of the subsurface BN measurement with the controlled surface field waveform. It is demonstrated that the shape of the BN rms profile (envelope) can be noticeably changed at different magnetization conditions and that the primary reason of these changes is a variation of the field rate dH/dt. In particular, even a number of the envelope peaks or their relative height can be changed by controlling the field waveform.
Keywords: Barkhausen noise, surface magnetic field, magnetization control, magnetic hysteresis, digital feedback loop