Large surface acoustic wave nonreciprocity in synthetic antiferromagnets

Abstract

We have studied the transmission of surface acoustic waves (SAWs) in ferromagnetic/non-magnetic/ferromagnetic tryilayers. The SAW scattering matrix is studied for devices with various non-magnetic spacer thickness, which defines the strength of the interlayer exchange coupling. We find the SAW transmission amplitude depends on their propagation direction when the two ferromagnetic layers are coupled antiferromagnetically. The degree of such SAW nonreciprocity increases with increasing exchange coupling strength and reaches 37 dB/mm for a device with the thinnest spacer layer. These results show the potential of interlayer exchange coupled synthetic antiferromagnets for viable acoustic nonreciprocal transmission devices, such as circulators and isolators.

References in corpus (2)

• Cavity magnomechanics with surface acoustic waves
• Acoustic spin Hall effect in strong spin-orbit metals

Cited by in corpus (7)

• Nonreciprocal magnetoacoustic waves in synthetic antiferromagnets with Dzyaloshinskii-Moriya interaction
• Magnon-phonon coupling of synthetic antiferromagnets in a surface acoustic wave cavity resonator
• Phononic-crystal cavity magnomechanics
• Cavity magnomechanical coupling with coupled magnon modes in a synthetic antiferromagnet
• Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution
• Spin current generation due to differential rotation
• On-chip all-electrical determination of the magnetoelastic coupling constant of magnetic heterostructures