Abstract. The anisotropy term in the specific wall energy and the gradient in the driving field force cylindrical domains to deviate from circular geometry. When the deviation is large, its treatment as a perturbation term is not valid. An elliptical boundary for the domain is suggested, and calculations are made for the effect of the eccentricity of the elliptical boundary upon the domain damping constant β, and the coercive force F_c. It is found that β and F_c decrease nonlinearly as functions of the increasing eccentricity if the domain is allowed to move along the ellipse major-axis direction. If the motion is along the ellipse minor-axis direction, β and F_c increase as the eccentricity is increased. The effective mass of the domain is found to be dependent upon the magnitude of the eccentricity.

Print publication: Issue 5 (21 March 1974)
Received 1 August 1973