Explosive growth of bistability in a cavity magnonic system

TL;DR

This paper theoretically explores how bistability in a cavity magnonic system can suddenly and explosively grow under certain conditions, revealing new nonlinear phenomena with potential spintronic applications.

Contribution

It uncovers the conditions for explosive bistability growth in cavity magnonics driven by photon-like polaritons, a novel nonlinear effect not previously reported.

Findings

Explosive growth of bistability occurs when driving the photon-like polariton mode.

Driving the magnon-like polariton mode results in normal bistability without explosion.

Simultaneous explosive bistability growth can happen in both polariton modes due to light-matter interaction.

Abstract

We conduct a theoretical investigation into explosive growth of bistability in a cavity magnonic system incorporating magnetic nonlinearity. In this system, the coupling between the magnon and photon generates the cavity magnon polaritons. When driving the photon-like polariton mode, the bistability can undergo a sudden transition with the increase of the driving power, resulting in an explosive growth of the bistable region by several times. Conversely, driving the magnon-like polariton mode only gives rise to normal bistability. This depends on whether the minimum driving power required to generate the bistability is non-monotonic with respect to the driving frequency. In addition, despite driving only the photon-like polariton mode, the photon- and magnon-like polariton modes can show simultaneous explosive growth of the bistability in microwave transmission, owing to the light-matter interaction. Our research sheds light on the hidden side of the nonlinear cavity magnonic system and provides a potential application for cavity spintronic devices founded on this novel feature.