Experimental confirmation of Ruderman-Kittel-Kasuya-Yosida-type interlayer Dzyaloshinskii-Moriya interaction across Ru spacers

The Ruderman--Kittel--Kasuya--Yosida (RKKY) interaction, a cornerstone of magnetism for over half a century, is now linked to a new frontier: interlayer Dzyaloshinskii--Moriya interaction (IL-DMI). In this study, the authors experimentally demonstrate that IL-DMI mediated by a Ru spacer exhibits a damped oscillatory behavior mirroring the classic RKKY signature. This discovery not only confirms the link between RKKY and IL-DMI but also unveils a new pathway for engineering chiral spin textures through spacer thickness control.