Linear excitation of short propagating spin waves in a pair of layered vortices with opposite circulation

The investigation of spin wave excitations in nano-magnetic systems is one of the key topics in modern magnetism. Typically, to excite short spin waves it is necessary either to use transducers of the size of a wavelength (micro-striplines or point-contacts) or to excite waves parametrically by a double-frequency spatially uniform microwave signal. Here we demonstrate that the efficient linear excitation of short propagating spin waves is possible in a tri-layer in which the magnetic layers form a vortex pair with opposite circulations.