Lumped circuit model for inductive antenna spin-wave transducers

TL;DR

This paper develops a simplified circuit model for inductive antenna spin-wave transducers, accounting for their resistance, inductance, and ferromagnetic interactions, to analyze their efficiency and scalability in magnonic devices.

Contribution

A novel lumped circuit model that incorporates ferromagnetic resonance effects for inductive antennas in spin-wave applications.

Findings

Model effectively predicts antenna behavior near ferromagnetic media

Scalability issues for nanoscale antennas are identified and discussed

Energy efficiency of transducers can be optimized using the model

Abstract

We derive a lumped circuit model for inductive antenna spin-wave transducers in the vicinity of a ferromagnetic medium. The model considers the antenna's Ohmic resistance, its inductance, as well as the additional inductance due to the excitation of ferromagnetic resonance or spin waves in the ferromagnetic medium. As an example, the additional inductance is discussed for a wire antenna on top of a ferromagnetic waveguide, a structure that is characteristic for many magnonic devices and experiments. The model is used to assess the scaling properties and the energy efficiency of inductive antennas. Issues related to scaling antenna transducers to the nanoscale and possible solutions are also addressed.