Magnetism in transition-metal systems emerges from exchange interactions that depend sensitively on carrier density. Yet leveraging this sensitivity to deliberately engineer exchange frustration and associated topological spin textures remains largely unexplored. Here, combining first-principles calculations with atomistic Monte Carlo simulations, we demonstrate that ferroelectric polarization enables electrostatic control of exchange frustration in the itinerant ferromagnet $\mathrm{SrRu}{\mathrm{O}}_3$. We show that electrostatic hole doping renormalizes competing exchange interactions, driving $\mathrm{SrRu}{\mathrm{O}}_3$ away from its bulk ferromagnetic ground state toward frustrated regimes, whereas electron doping largely preserves ferromagnetism. At $\mathrm{BaTi}{\mathrm{O}}_3/\mathrm{SrRu}{\mathrm{O}}_3$ interfaces, polarization-induced charge depletion modulates layer-dependent exchange couplings, enhancing competition between first, second, and third nearest-neighbor exchanges. The resulting exchange frustration stabilizes a sequence of magnetic phases as a function of thickness and applied magnetic field, including stripe and spiral states, topological meron and bimeron textures, and diverse skyrmionic objects. A minimal spin model identifies exchange frustration as the primary control parameter governing these crossovers, with magnetic anisotropy, Dzyaloshinskii-Moriya interaction, and external field selecting the emergent topology. Our results establish electrostatic doping as a route to engineer frustrated and topological magnetism in itinerant oxide metals.

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• Exchange interaction
• Magnetic order
• Magnetic texture
• Magnetism
• Skyrmions
• Spin spiral
• Complex oxides
• Ferroelectrics
• Ferromagnets
• Magnetic thin films
• Noncollinear magnets
• Perovskites
• First-principles calculations
• Micromagnetic modeling
• Tight-binding model