- Letter
Curvature-driven ac-assisted creep dynamics of magnetic domain walls
Phys. Rev. B 103, L220409 – Published 24 June, 2021
DOI: https://doi.org/10.1103/PhysRevB.103.L220409
Abstract
The dynamics of micrometer-sized magnetic domains in ultrathin 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.
