We have used trapped spinwave or edge modes of magnetic precession to probe the magnetic environment near magnetic film edges magnetized perpendicular to the edge. Micromagnetic models of dynamics in stripes reveal that the edge mode frequency-field relationship depends on whether the edge surface is vertical or tapered, while the bulk modes are nearly unaffected. The models show the edge mode frequency going to zero at the edge saturation field. This critical field becomes much less distinct for applied fields misaligned from the by as little as 1 degree. Ferromagnetic resonance and Brillouin light scattering measurements of the edge modes in an array of 480 nm wide x 12 nm thick Ni(80)Fe(20) stripes have a lower edge saturation field than the vertical edge models, but agree well with the model of 45 degree tapered edges.
Citation: Journal of Applied Physics
Pub Type: Journals
edge mode, ferromagnetic resonance, micromagnetic, trapped sinwave