Research | Hayashi Group

Highly non-reciprocal transmission of surface acoustic waves

We find the transmission of surface acoustic waves (SAWs) in ferromagnetic/non-magnetic/ferromagnetic tryilayers is non-reciprocal. The SAW transmission amplitude depends on its propagation direction when the two ferromagnetic layers are coupled antiferromagnetically. The degree of such SAW nonreciprocity increases with increasing exchange coupling strength. These results show the potential of interlayer exchange coupled synthetic antiferromagnets for viable acoustic nonreciprocal transmission devices, such as circulators and isolators.

Large surface acoustic wave nonreciprocity in synthetic antiferromagnets
H. Matsumoto, T. Kawada, M. Ishibashi, M. Kawaguchi, M. Hayashi
Appl. Phys. Express 15, 063003 (2022).