Definition of the interlayer interaction type in magnetic multilayers analyzing the shape of the ferromagnetic resonance peaks

We present theoretical study of ferromagnetic resonance in a system of two coupled magnetic layers. We show that an interaction between the layers leads to the occurrence of the so-called Fano resonance. The Fano resonance changes the shape of the ferromagnetic resonance peak. It introduces a peak asymmetry. The asymmetry type is defined by the sign of the interaction between the magnetic layers. Therefore, studying the shape of the ferromagnetic resonance peaks one can define the type of the interlayer coupling (ferromagnetic or antiferromagnetic). We show that using numerical simulations one can estimate a magnitude of the interaction by fitting the asymmetric resonance peaks.