Curvature-driven AC-assisted creep dynamics of magnetic domain walls

DOMENICHINI, P.; F.N. PARIS; CAPELUTO, M. G.; GRANADA, M.; GEORGE, J.-M.; G. PASQUINI; A. KOLTON

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2021

1098-0121

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.