Two-magnon frequency-pulling effect in ferromagnetic resonance

Abstract

We report the experimental observation in thin films of the hybridization of the uniform ferromagnetic resonance mode with nonuniform magnons as a result of the two-magnon scattering mechanism, leading to a frequency-pulling effect on the ferromagnetic resonance. This effect, when not properly accounted for, leads to a discrepancy in the dependence of the ferromagnetic resonance field on frequency for different field orientations. The frequency-pulling effect is the complement of the broadening of the ferromagnetic resonance lineshape by two-magnon scattering and can be calculated using the same parameters. By accounting for the two-magnon frequency shifts through these means, consistency is achieved in fitting data from in-plane and perpendicular-to-plane resonance conditions.

arXiv comment4 pages, 4 figures

References in corpus (5)

• Spin Transfer Torques
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Interface-Induced Phenomena in Magnetism
• Ferromagnetic resonance linewidth in ultrathin films with perpendicular magnetic anisotropy
• The interplay of large two-magnon ferromagnetic resonance linewidths and low Gilbert damping in Heusler thin films