Electromotive forces generated in 3d-transition ferromagnetic metal films themselves under their ferromagnetic resonance

TL;DR

This study investigates the electromotive forces generated in 3d-transition ferromagnetic metal films during ferromagnetic resonance, revealing different dominant effects in Fe, Co, and Ni80Fe20 films based on their material properties.

Contribution

It provides a comparative analysis of EMF generation mechanisms in different ferromagnetic metals under FMR, highlighting the roles of anomalous Hall and inverse spin-Hall effects.

Findings

Fe and Co films primarily exhibit EMF from the anomalous-Hall effect.

Ni80Fe20 film mainly shows EMF from the inverse spin-Hall effect.

Differences in spin polarization, conductivities, and resistivity explain the observed behaviors.

Abstract

We report the electromotive force (EMF) properties generated in 3d-transition ferromagnetic metal (FM = Fe, Co, and Ni80Fe20) films themselves under their ferromagnetic resonance (FMR). For Fe and Co films, the EMF due to the anomalous-Hall effect is dominantly generated under their FMR. Meanwhile, for a Ni80Fe20 film, the EMF due to the inverse spin-Hall effect in the Ni80Fe20 film itself under the FMR is mainly generated. This tendency is qualitatively explained with differences of the spin polarization, the spin Hall conductivity, the anomalous Hall conductivity, the magnetization saturation, and the resistivity of the FM films.