Ferromagnetic resonance excitation of two-dimensional wall structures in magnetic stripe domains

Abstract

Using ferromagnetic resonance, an experimental approach is presented to evidence and analyze the small amplitude excitations of inhomogeneous magnetization distributions in thin magnetic films. This approach is applied to the complex two-dimensional (2D) domain walls of Co(0001) stripe domains, which contain a reduced Bloch part in the film center and extended flux closure caps at the film surface. Upon varying the pumping field orientation, the different regions of the domain walls, the flux closure caps and the domains can be selectively excited, yielding a rich excitation spectrum with up to seven modes. In combination with static investigations and 2D micromagnetic simulations these modes can be assigned to the domain-wall resonance modes, the oscillations of the flux closure caps, as well as to the excitation of the domain magnetization.