Magnonic Josephson junctions and synchronized precession

Nakata, Koki   ; Zou, J.*; Klinovaja, J.*; Loss, D.*

We uncover theoretically that a surprisingly rich dynamics can emerge in magnetic junctions due to intrinsic non-local damping, using analytical and numerical methods. In particular, under microwave pumping, we show that coherent spin precession in the right and left insulating ferromagnet (FM) of the junction becomes synchronized by non-local damping and thereby a magnonic analog of the Josephson junction emerges, where stands here for the relative precession phase of right and left FM in the stationary limit. Remarkably, decreases monotonically from to as the magnon-magnon interaction, arising from spin anisotropies, increases. Moreover, we also find a magnonic diode effect giving rise to rectification of magnon currents. Our predictions are readily testable with current device and measurement technologies at room temperatures.