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We show a method to control magnetic interfacial effects in multilayers withDzyaloshinskii-Moriya interaction (DMI) using helium (He$^{+}$) ionirradiation. We report results from SQUID magnetometry, ferromagnetic resonanceas well as Brillouin light scattering results on multilayers with DMI as afunction of irradiation fluence to study the effect of irradiation on themagnetic properties of the multilayers. Our results show clear evidence of theHe$^{+}$ irradiation effects on the magnetic properties which is consistentwith interface modification due to the effects of the He$^{+}$ irradiation.This external degree of freedom offers promising perspectives to furtherimprove the control of magnetic skyrmions in multilayers, that could push themtowards integration in future technologies.

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