Self-Similar Barkhausen Noise in Magnetic Domain Wall Motion

Abstract

A model for domain wall motion in ferromagnets is analyzed. Long-range\nmagnetic dipolar interactions are shown to give rise to self-similar dynamics\nwhen the external magnetic field is increased adiabatically. The power spectrum\nof the resultant Barkhausen noise is of the form $1/\\omega^\\alpha$, where\n$\\alpha\\approx 1.5$ can be estimated from the critical exponents for interface\ndepinning in random media.\n