Non-Hermitian Topological Magnonics

To understand the nodal magnon-photon parameter, we will examine the mode propagating towards the saturated magnetization, which is in the z direction in the figure. The evolution of the real and imaginary components of ω_R and ω_I is shown in the movie as the thickness of the ferromagnetic layer decreases. It is observed that at a certain thickness, both the real and imaginary components coincide.