On the power spectrum of magnetization noise

Abstract Understanding the power spectrum of the magnetization noise is a long standing problem. While the earlier work considered superposition of ‘elementary’ jumps, without reference to the underlying physics, recent approaches relate the properties of the noise with the critical dynamics of domain walls. In particular, a new derivation of the power spectrum exponent has been proposed for the random-field Ising model. We apply this approach to the experimental data, showing its validity and limitations.