Micromagnetic Calculation of the High Frequency Dynamics of Nano-Size Rectangular Ferromagnetic Stripes
O Gerardin, H Le Gall, Michael J. Donahue, N Vukadinovic
Nano-size ferromagnetic dots, wires and stripes are of strong interest for future high speed magnetic sensors and ultra high 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 often used to describe the switching process. However, these models do not take into account the non-uniformity of the magnetization structure. In this paper dynamic micromagnetic calculations are used in determining the high frequency susceptibility of a 1 m x 50 nm x 5 nm permalloy stripe. The studied structure exhibits two resonance modes. The higher, primary peak is around 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 divergence of the magnetization distribution near the end of the stripe.
, Le Gall, H.
, Donahue, M.
and Vukadinovic, N.
Micromagnetic Calculation of the High Frequency Dynamics of Nano-Size Rectangular Ferromagnetic Stripes, Journal of Applied Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=150798
(Accessed February 29, 2024)