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

Abstract

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.