Electromotive force generation in a ferromagnetic metal thin film under the ferromagnetic resonance excitation with permanent magnets

TL;DR

This study demonstrates that ferromagnetic resonance (FMR) in a Ni80Fe20 thin film, excited by permanent magnets, can generate electromotive force, suggesting a simple method for converting ambient RF energy into electrical energy.

Contribution

The paper introduces a novel approach using permanent magnets for FMR excitation to generate EMF in a ferromagnetic thin film, enabling simple RF energy harvesting.

Findings

Successful FMR spectrum measurement of Ni80Fe20 film.

Generation of electromotive force under FMR with permanent magnets.

Potential application in ambient RF energy transduction.

Abstract

Ferromagnetic resonance (FMR) excitation of a ferromagnetic metal single-layer film was tried by using a couple of permanent magnets as the source of the uniform static magnetic field and by using a co-planer waveguide connected with a network analyzer as the source of the radiofrequency (RF) magnetic field. A typical FMR spectrum of a ferromagnetic Ni$_{80}$Fe$_{20}$ thin film was successfully obtained and a clear electromotive force (EMF) was generated in the Ni$_{80}$Fe$_{20}$ thin film under the FMR excitation with the permanent magnets. That is, we achieved EMF generation in a Ni$_{80}$Fe$_{20}$ thin film under the FMR excitation with the permanent magnets, which can be applied as a simple energy transduction technology from ambient RF energy to electrical energy.