Micromagnetic calculation of the high frequency dynamics of nano-size rectangular ferromagnetic stripes

Nano-size ferromagnetic dots, wires, and stripes are of great interest for future high speed magnetic sensors and ultrahigh density magnetic storage. High frequency dynamic excitation is one way to investigate the time scale of the magnetization reversal in submicron particles with lateral nanometer dimension. Macroscopic models like the Landau-Lifshitz (LL) model are ofte n used to describe the switching process. However, these models do not take into account the nonuniformity of the magnetization structure. In this art icle dynamic micromagnetic calculations are used in determining the high fr equency susceptibility of a 1 mum x 50 nm x 5 nm Permalloy stripe. The stud ied structure exhibits two resonance modes. The higher, primary peak is aro und 10 GHz and can be identified with the uniform resonance mode predicted by the macroscopic LL model. The low frequency peak is attributed to the sp lay of the magnetization distribution near the end of the stripe. (C) 2001 American Institute of Physics.