Giant magnetic broadening of ferromagnetic resonance in a GMR Co/Ag/Co/Gd quadlayer

TL;DR

This paper investigates how magnetic damping in ferromagnetic resonance is significantly affected by the magnetic alignment in a Co/Ag/Co/Gd multilayer, revealing a strong link between magnetic damping and giant magnetoresistance effects.

Contribution

It demonstrates the impact of magnetic alignment on damping and magnetoresistance in a multilayer structure using antiferromagnetic coupling between Co and Gd.

Findings

Sharp increase in magnetic damping during transition from parallel to antiparallel alignment

Magnetic damping change is analogous to giant magnetoresistance resistivity changes

Antiferromagnetic coupling influences both damping and GMR effects

Abstract

Both magnetic-resonance damping and the giant magnetoresistance effect have been predicted to be strongly affected by the local density of states in thin ferromagnetic films. We employ the antiferromagnetic coupling between Co and Gd to provide a spontaneous change from parallel to antiparallel alignment of two Co films. A sharp increase in magnetic damping accompanies the change from parallel to antiparallel alignment, analogous to resistivity changes in giant magnetoresistance.