BUSCADOR RECOLECTA

This dataset includes the original data used to draft the manuscript for the publication "Room-Temperature Solid-State Nitrogen-Based Magneto-Ionics in CoxMn1−xN Films" (DOI: 10.1002/adfm.202404487). The data includes the magnetic response of CoMnN layers with varying Co composition, as well as the temperature dependence of the Co0.55Mn0.45N layer, which had the highest magneto-ionic response. Additionally, the structural XRD and HRTEM characterization of the samples is also provided for all compositions, and specifically for the Co0.55Mn0.45N after electrically actuating it. Composition studies to check how the nitrogen evolved after the electric actuation on the Co0.55Mn0.45N is also provided in the form of EELS mappings and line scans, as well as positron lifetime studies. Finally, the oxidation state of the Co and Mn comprised in the Co0.55Mn0.45N layer was studied by synchrotron polarized XAS tecniques, before and after electric actuation, with a temperature dependence, the data of which is also supplied in the dataset. The origin of the magnetic changes after the electric actuation are succesfully correlated to the structural and chemical evolution of the sample, resulting in a new pathway for low-energy spintronic devices.

This dataset contains the information on our recent body of work on transition-metal oxide-based magneto-ionics and all the relevant data files. In this work, we propose a nanoscale-engineered magneto-ionic architecture (comprising a thin solid electrolyte in contact with a liquid electrolyte), that drastically enhances cyclability while preserving sufficiently high electric fields to trigger ion motion. Specifically, we show that the insertion of a highly nanostructured (amorphous-like) Ta layer (with suitable thickness and electric resistivity) between a magneto-ionic target material (i.e., Co3O4) and the liquid electrolyte, increases magneto-ionic cyclability from < 30 cycles (when no Ta is inserted) to more than 800 cycles. The Ta layer is effective in trapping oxygen and hindering O2– ions from moving into the liquid electrolyte, thus keeping O2– motion mainly restricted between Co3O4 and Ta when voltage of alternating polarity is applied. We demonstrate that this approach provides a suitable strategy to boost magneto-ionics by combining the benefits of solid and liquid electrolytes in a synergetic manner.

This dataset contains the information on our recent work on multilevel magnetic synapses for neuromorphic applications and all the relevant data files. In the present work, we exploit voltage-driven nitrogen ion motion in transition metal nitride (CoFeN) thin films (i.e., nitrogen magneto-ionics) to emulate biological synapses. In the proposed device, we have realized distinct multilevel non-volatile magnetic states for analog computing and multi-state storage. Moreover, essential synaptic functionalities of the human brain have been successfully simulated. The device exhibits an excellent synapse with a remarkable retention time (∼ 6 months), high switching ratio and large endurance (∼103), for hardware implementation of NC. This research provides new insight into exploiting magneto-ionic-based synaptic devices for spin-based neuromorphic systems.

This dataset contains the information on our recent body of work on wireless magneto-ionics by bipolar electrochemistry approach and all the relevant data files. So far, magneto-ionics has been achieved through direct electrical connections to the actuated material. Here we evidence that an alternative way to reach such control exists in a wireless manner. Induced polarization in the conducting material immersed in the electrolyte, without direct wire contact, promotes wireless bipolar electrochemistry, an alternative pathway to achieve voltage-driven control of magnetism based on the same electrochemical processes involved in direct-contact magneto-ionics. A significant tunability of magnetization is accomplished for cobalt nitride thin films, including transitions between paramagnetic and ferromagnetic states. Such effects can be either volatile or non-volatile depending on the electrochemical cell configuration. These results represent a fundamental breakthrough that may inspire future device designs for applications in bioelectronics, catalysis, neuromorphic computing, or wireless communications.

This dataset contains the information on our recent body of work on the study of magneto-ionic properties in structure/composition-engineered ternary nitrides 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. For this purpose, stability, reversibility, endurance, and ion motion rates need to be synergistically optimized. Among various ions, nitrogen has demonstrated superior magneto-ionic performance compared to classical species such as oxygen or lithium. Here, we show that ternary Co1−xFexN compound exhibits an unprecedented nitrogen magneto-ionic response. Partial substitution of Co by Fe in binary CoN is shown to be favorable in terms of generated magnetization, cyclability and ion motion rates. Specifically, the Co0.35Fe0.65N films exhibit an induced saturation magnetization of 1500 emu cm–3, a magneto-ionic rate of 35.5 emu cm–3 s–1 and endurance exceeding 103 cycles. These values significantly surpass those of other existing nitride and oxide systems. This improvement can be attributed to the larger saturation magnetization of Co0.35Fe0.65 compared to individual Co and Fe, the nature and size of structural defects in as-grown films of different composition, and the dissimilar formation energies of Fe and Co with N in the various developed crystallographic structures.