Analysis of the Circuit-Field Interactions in Propagating Spin-Wave Experiments

In propagating spin-wave experiments, a micrometer-wide inductive antenna excites magnetostatic spin waves in a magnetic thin film. These spin waves propagate along the film and are readout by a second displaced antenna to observe the processed signal. We present a numerical model for describing the interaction between the exciting antenna and magnetic film and eventually present a discussion on the efficiency of the excitation process. Our model is based on coupling the partial element equivalent circuit method - usually applied to the simulation of multiconductor circuits, to the micromagnetic model-based on the linearized Landau-Lifschitz-Gilbert equation representing the magnetic film. The problem involves different geometric dimensions: ranging from the millimeter scale in the supply circuit to the micrometer one for the antenna interacting with the magnetic material. In this paper, we report the study of a possible decoupling between the two scales based on an equivalent circuit of the magnetic phenomenon.