  We propose a method to generate magnetic skyrmions by focusing spin waves
totally reflected by a curved film edge. Based on the principle of identical
magnonic path length, we derive the edge contour that is parabolic and
frequency-independent. Micromagnetic simulations are performed to verify our
theoretical design. It is found that under proper conditions, magnetic droplet
first emerges near the focal point where the spin-wave intensity has been
significantly enhanced, and then converts to magnetic skyrmion accompanied by a
change of the topological charge. The phase diagram about the amplitude and
frequency of the driving field for skyrmion generation is obtained. Our finding
would be helpful for the designment of spintronic devices combing the advantage
of skyrmionics and magnonics.
