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Here, the catalytic degradation of organic compounds is reported by exploiting the magnetoelectric nature of cobalt ferrite–bismuth ferrite (CFO–BFO) core–shell nanoparticles. The combination of magnetostrictive CFO with multiferroic BFO gives rise to a magnetoelectric engine that purifies water under wireless magnetic fields via advanced oxidation processes, without involvement of any sacrificial molecules or cocatalysts. Magnetostrictive CoFe₂O₄ nanoparticles are fabricated using hydrothermal synthesis, followed by sol–gel synthesis to create the multiferroic BiFeO₃ shell. Theoretical modeling is performed to study the magnetic‐field‐induced polarization on the surface of magnetoelectric nanoparticles. The results obtained from these simulations are consistent with experimental findings of the piezoforce microscopy analysis, where changes in piezoresponse of the nanoparticles under magnetic fields are …