Magneto-optic gradient effect in domain-wall images: At the crossroads ofmagneto-optics and micromagnetics

摘要

An anomalous symmetry of magneto-optical images of ferromagnetic domain walls was reported by Schafer and Hubert [Phys. Status Solidi A 118, 271 (1990)] and interpreted in terms of light amplitudes proportional to the magnetization gradient. We present analytic and numerical calculations supporting such proportionality under additional conditions implied by classical rules of micromagnetics and address some objections presented by Banno [Phys. Rev. A 77, 033818 (2008)] against such proportionality.