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We show a method to control magnetic interfacial effects in multilayers with Dzyaloshinskii–Moriya interaction (DMI) using helium (He   $$^{+}$$  + ) ion irradiation. We report results from SQUID magnetometry, ferromagnetic resonance as well as Brillouin light scattering results on multilayers with DMI as a function of irradiation fluence to study the effect of irradiation on the magnetic properties of the multilayers. Our results show clear evidence of the He   $$^{+}$$  + irradiation effects on the magnetic properties which is consistent with interface modification due to the effects of the He   $$^{+}$$  + irradiation. This external degree of freedom offers promising perspectives to further improve the control of magnetic skyrmions in multilayers, that could push them towards integration in future technologies.

Tailoring interfacial effect in multilayers with Dzyaloshinskii–Moriya interaction by helium ion irradiation