Left-handed behavior and low-loss passband in a ferromagnetic sandwich structure

摘要

The electromagnetic properties of a ferromagnetic-dielectric-ferromagnetic sandwich structure were studied by experiment and simulation. In the transmission spectra, an obvious passband emerges in the broad forbidden band of ferromagnetic resonance because the strong coupling of two resonating ferrite slabs excites a propagating mode. The passband has ultralow loss (～-1 dB) due to the feature of surface wave and the bias magnetic field pump. A negative phase evolution of propagating wave occurs in the second slab only based on the magnetic resonance. The ultralow insertion loss of passband and magnetotunability endow the sandwich structure a promising application future.