Strong Magnon-Magnon Coupling in Synthetic Antiferromagnets

Abstract

Synthetic antiferromagnet, comprised of two ferromagnetic layers separated by a non-magnetic layer, possesses two uniform precession resonance modes: in-phase acoustic mode and out-of-phase optic mode. In this work, we theoretically and numerically demonstrated the strong coupling between acoustic and optic magnon modes. The strong coupling is attributed to the symmetry breaking of the system, which can be realized by tilting the bias field or constructing an asymmetrical synthetic antiferromagnet. It is found that the coupling strength can be highly adjusted by tuning the tilting angle of bias field, the magnitude of antiferromagnetic interlayer exchange coupling, and the thicknesses of ferromagnetic layers. Furthermore, the coupling between acoustic and optic magnon modes can even reach the ultrastrong coupling regime. Our findings show high promise for investigating quantum phenomenon with a magnonic platform.

4 Figures, Accepted by APL

References in corpus (5)

• Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime
• Strongly coupled magnons and cavity microwave photons
• Tunable magnon-magnon coupling in synthetic antiferromagnets
• Magnetization dynamics in synthetic antiferromagnets: Role of dynamical energy and mutual spin pumping
• Strong coupling between magnons confined in a single magnonic cavity

Cited by in corpus (2)

• Mesoscopic magnetic systems: from fundamental properties to devices
• Dynamic Fingerprints of Synthetic Antiferromagnet Nanostructures with Interfacial Dzyaloshinskii-Moriya Interaction