The dynamics of micrometer-sized magnetic domains in ultra-thin ferromagnetic films is so dramatically slowed down by quenched disorder that the spontaneous elastic tension collapse becomes unobservable at ambient temperature. By magneto-optical imaging we show that a weak zero-bias AC magnetic field can assist such curvature-driven collapse, making the area of a bubble to reduce at a measurable rate, in spite of the negligible effect that the same curvature has on the average creep motion driven by a comparable DC field. An analytical model explains this phenomenon quantitatively.
@article{arxiv.2012.09377,
title = {Curvature-driven AC-assisted creep dynamics of magnetic domain walls},
author = {P. Domenichini and F. N. Paris and M. G. Capeluto and M. Granada and J. -M. George and G. Pasquini and A. B. Kolton},
journal= {arXiv preprint arXiv:2012.09377},
year = {2021}
}