Hard magnetic bubbles

Factors affecting domain wall mobility in thin ferromagnetic metal films

“…Extrapolating these results indicates that the contributions of the eddy-current and intrinsic damping mechanisms to H/v becomes equal t o a thickness of r 5 2 0 0 A. Factors affecting domain wa.11 mobility I n view of the discussion given by O'Dell (1979), it is of interest t'o compare eddy-current damping for one-dimensional and two-dimensional walls. For the latter, domain wall widths were calculat,ed from the data of Aharoni and Jakubovics (1979 a) using the definition of domain wall width proposed by Jakubovics (1978).…”

“…That meant mobilities in that thickness region should be very much different from the theoretical estimates, according to which eddy current damping is negligible with respect to intrinsic loss mechanism, until the film thickness becomes much larger. O'Dell (1979) thus concluded that the theoretical estimates were also wrong. He assigned the main error to the assumption of a onedimensional domain wall (in particular in the calculations of Patton, McGill and Wilts (1966)), whereas it is known, since the work of LaBonte (1969), that walls in 1000 A Permalloy films have a complex two-dimensional vortex structure.…”