  Superconductor/Ferromagnet (S/F) hybrid systems show interesting
magneto-transport behaviors that result from the transfer of properties between
both constituents. For instance, magnetic memory can be transferred from the F
into the S through the pinning of superconducting vortices by the ferromagnetic
textures. The ability to tailor this type of induced behavior is important to
broaden its range of applications. Here we show that engineering the F
magnetization reversal allows tuning the strength of the vortex pinning (and
memory) effects, as well as the field range in which they appear. This is done
by using magnetic multilayers in which Co thin films are combined with
different heavy metals (Ru, Ir, Pt). By choosing the materials, thicknesses,
and stacking order of the layers, we can design the characteristic domain size
and morphology, from out-of-plane magnetized stripe domains to much smaller
magnetic skyrmions. These changes strongly affect the magneto-transport
properties. The underlying mechanisms are identified by comparing the
experimental results to a magnetic pinning model.

Superconductivity