Strain-tuned magnetic resonance in in-plane magnetized synthetic antiferromagnets

Abstract

We investigate the effect of strain on the magnetic resonance characteristics of in-plane magnetized synthetic antiferromagnets (SAFs) through micromagnetic simulations and theoretical modeling. By applying strain via a piezoelectric substrate, we modulate the in-plane uniaxial anisotropy of the ferromagnetic layers and analyze its impact on the ferromagnetic resonance spectra. The results show that strain significantly alters the spin-wave dispersion and resonance modes, leading to changes in magnetic ordering. A critical transition from a spin-flop to a spin-flip state is observed as strain-induced anisotropy increases. Additionally, our study quantifies the correlation between strain variations and the effective anisotropic field, demonstrating the tunability of magnetic properties via strain. We observe good agreement between the simulations and analytical predictions by including a magnetoelastic anisotropy field in our theoretical framework. These findings provide valuable insights into the magnetoelastic response of nanoscale SAFs and highlight the potential of strain-mediated control of magnetization dynamics for spintronic applications and microwave communication technologies.