Magnon junction effect induced by bulk acoustic waves

As an analog to a magnetic tunneling junction, a magnon junction composed of a ferromagnetic insulator (FMI)/antiferromagnetic insulator (AFMI)/ferromagnetic insulator heterostructure has been proposed in recent years. In a magnon junction, the magnon current transmission can be adjusted by manipulating the angle of magnetic moments in the two FM layers. However, the mechanism of this magnon junction effect is still not quite clear. In this paper, we numerically calculate the bulk acoustic wave-induced magnon junction effect. Our results emphasize the crucial role played by variations in magnetic structures within the AFMI spacer when the alignments of magnetic moments in the two FMI layers are adjusted between the parallel and antiparallel state. These differences significantly influence the modulation of magnon current transmission. This is different from the chirality-relevant magnon scattering mechanism as assumed in previous works.