Voltage-driven motion of nitrogen ions: a new paradigm for magneto-ionics

Magneto-ionics, understood as voltage-driven ion transport in magnetic materials, has largely relied on controlled migration of oxygen ions. Here, we demonstrate room-temperature voltage-driven nitrogen transport ( i.e ., nitrogen magneto-ionics) by electrolyte-gating of a CoN film. Nitrogen magneto...

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Bibliographic Details
Published in:Nature communications Vol. 11; no. 1; pp. 5871 - 8
Main Authors: de Rojas, Julius, Quintana, Alberto, Lopeandía, Aitor, Salguero, Joaquín, Muñiz, Beatriz, Ibrahim, Fatima, Chshiev, Mairbek, Nicolenco, Aliona, Liedke, Maciej O., Butterling, Maik, Wagner, Andreas, Sireus, Veronica, Abad, Llibertat, Jensen, Christopher J., Liu, Kai, Nogués, Josep, Costa-Krämer, José L., Menéndez, Enric, Sort, Jordi
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 18.11.2020
Nature Publishing Group
Nature Portfolio
Subjects:
147/137
147/143
639/301/119/544
639/301/119/997
Condensed Matter
Engineering Sciences
Humanities and Social Sciences
Materials Science
Micro and nanotechnologies
Microelectronics
multidisciplinary
Physics
Science
Science (multidisciplinary)
ISSN:2041-1723, 2041-1723
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Summary:Magneto-ionics, understood as voltage-driven ion transport in magnetic materials, has largely relied on controlled migration of oxygen ions. Here, we demonstrate room-temperature voltage-driven nitrogen transport ( i.e ., nitrogen magneto-ionics) by electrolyte-gating of a CoN film. Nitrogen magneto-ionics in CoN is compared to oxygen magneto-ionics in Co 3 O 4 . Both materials are nanocrystalline (face-centered cubic structure) and show reversible voltage-driven ON-OFF ferromagnetism. In contrast to oxygen, nitrogen transport occurs uniformly creating a plane-wave-like migration front, without assistance of diffusion channels. Remarkably, nitrogen magneto-ionics requires lower threshold voltages and exhibits enhanced rates and cyclability. This is due to the lower activation energy for ion diffusion and the lower electronegativity of nitrogen compared to oxygen. These results may open new avenues in applications such as brain-inspired computing or iontronics in general. In magneto-ionics, ion migration through the material is used to change the materials magnetic properties. Typically oxygen is used as the mobile ion. In this manuscript, the authors demonstrate controlled migration of nitrogen in a CoN film, expanding the possibilities of magneto-ionics.
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PMCID: PMC7676264
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-19758-x