  We present a near-field diffraction model for spin waves in perpendicularly
magnetized films applicable in any geometries of excitation fields. This model
relies on Kalinikos-Slavin formalism to express the dynamic susceptibility
tensor in k-space, and calculate the diffraction patterns via inverse
2D-Fourier transform of the response functions. We show an excellent
quantitative agreement between our model and MuMax3 micro-magnetic simulations
on two different geometries of antennas. Our method benchmarks spin wave
diffraction in perpendicularly magnetized films, and is readily applicable for
future designs of magnon beamforming and interferometric devices.
