Dataset for "Magneto-ionic engineering of antiferromagnetically RKKY-coupled multilayers"

This dataset contains the information on our recent body of work on the study of magneto-ionic engineering of antiferromagnetically RKKY-coupled multilayers and all the relevant data files. Magneto-ionics, an emerging approach to manipulate magnetism that relies on voltage-driven ion motion, holds the promise to boost energy efficiency in information technologies such as spintronic devices or future non-von Neumann computing architectures. Despite the technological potential of synthetic antiferromagnets (SAFs), magneto-ionic control of antiferromagnetic coupling in multilayers (MLs) has only recently been explored and remains poorly understood, particularly in systems free of platinum-group metals. In this work, we achieve room-temperature voltage control of Ruderman–Kittel–Kasuya–Yosida (RKKY) interactions in Co/Ni-based SAFs. We observe transitions between ferrimagnetic (uncompensated) and antiferromagnetic (fully compensated) states, as well as significant modulation of the RKKY bias field offset, emergence of additional switching events, and formation of skyrmion-like or pinned domain bubbles under relatively low gating voltages. These phenomena are attributed to voltage-driven oxygen migration in the MLs, as confirmed through microscopic and spectroscopic analyses. This study underscores the potential of voltage-triggered ion migration as a versatile tool for post-synthesis tuning of magnetic multilayers, with potential applications in magnetic-field sensing, energy-efficient memory devices, and spintronics.