  Raman transitions are used in quantum simulations with ultracold atoms for
cooling, spectroscopy and creation of artificial gauge fields. Spatial shaping
of the Raman fields allows local control of the effective Rabi frequency, which
can be mapped to the atomic spin. Evanescent Raman fields are of special
interest as they can provide a new degree of control emanating from their
rapidly decaying profile and for their ability to generate features below the
diffraction limit. This opens the door to the formation of sub-wavelength spin
textures. In this work, we present a theoretical and numerical study of Raman
Rabi frequency in the presence of evanescent driving fields. We show how spin
textures can be created by spatially varying driving fields and demonstrate a
skyrmionium lattice - a periodic array of topological spin excitations, each of
which is composed of two skyrmions with opposite topological charges. Our
results pave the way to quantum simulation of spin excitation dynamics in
magnetic materials, especially of itinerant spin models.
