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Controlling the perpendicular magnetic anisotropy (PMA) in thin films hasreceived considerable attention in recent years due to its technologicalimportance. PMA based devices usually involve heavy-metal(oxide)/ferromagnetic-metal bilayers, where, thanks to interfacial spin-orbitcoupling (SOC), the in-plane (IP) stability of the magnetization is broken.Here we show that in V/MgO/Fe(001) epitaxial junctions with competing in-planeand out-of-plane (OOP) magnetic anisotropies, the SOC mediated interactionbetween a ferromagnet (FM) and a superconductor (SC) enhances the effective PMAbelow the superconducting transition. This produces a partial magnetizationreorientation without any applied field for all but the largest junctions,where the IP anisotropy is more robust; for the smallest junctions there is areduction of the field required to induce a complete OOP transition($H_\text{OOP}$) due to the stronger competition between the IP and OOPanisotropies. Our results suggest that the degree of effective PMA could becontrolled by the junction lateral size in the presence of superconductivityand an applied electric field. We also discuss how the $H_\text{OOP}$ fieldcould be affected by the interaction between magnetic stray fields andsuperconducting vortices. Our experimental findings, supported by numericalmodelling of the ferromagnet-superconductor interaction, open pathways toactive control of magnetic anisotropy in the emerging dissipation-freesuperconducting spin electronics.

Superconductivity assisted change of the perpendicular magnetic anisotropy in V/MgO/Fe junctions