Resonances in Ferromagnetic Gratings Detected by Microwave Photoconductivity

TL;DR

This paper explores how microwave-induced spin excitations affect charge transport in ferromagnetic gratings, revealing resonant phenomena like FMR and FMAR, and offers a macroscopic model explaining these effects.

Contribution

It introduces experimental observations of microwave photoresistance resonances in ferromagnetic gratings and a macroscopic model explaining the ferromagnetic antiresonance.

Findings

Detection of ferromagnetic resonance (FMR) and antiresonance (FMAR) in microwave photoresistance

Macroscopic model based on Maxwell and Landau-Lifschitz equations explains FMAR

Insights into photonic, spintronic, and charge interactions in FM microstructures

Abstract

We investigate the impact of microwave excited spin excitations on the DC charge transport in a ferromagnetic (FM) grating. We observe both resonant and nonresonant microwave photoresistance. Resonant features are identified as the ferromagnetic resonance (FMR) and ferromagnetic antiresonance (FMAR). A macroscopic model based on Maxwell and Landau-Lifschitz equations reveals the macroscopic nature of the FMAR. The experimental approach and results provide new insight in the interplay between photonic, spintronic, and charge effects in FM microstructures.