Curvature-driven ac-assisted creep dynamics of magnetic domain walls
- Domenichini, Pablo Exequiel
- Paris, F.
- Capeluto, Maria Gabriela
- Granada, Mara
- George, J. M.
- Pasquini, Gabriela
- Kolton, Alejandro Benedykt
DOIAbstract
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.Fil: Domenichini, Pablo Exequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Institut...
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