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Enhancing magneto-ionic effects in cobalt oxide films by electrolyte engineering

Authors :
Sofia Martins
Enric Menéndez
Xavier Solans Monfort
Luis Rodriguez-Santiago
Mariona Sodupe
Jordi Sort
Zheng Ma
Eva Pellicer
Source :
Nanoscale Horizons. 8:118-126
Publication Year :
2023
Publisher :
Royal Society of Chemistry (RSC), 2023.

Abstract

Altres ajuts: Red Española de Supercomputación (QHS-2022-2-0029) Electric-field-driven ion motion to tailor magnetic properties of materials (magneto-ionics) offers much promise in the pursuit of voltage-controlled magnetism for highly energy-efficient spintronic devices. Electrolyte gating is a relevant means to create intense electric fields at the interface between magneto-ionic materials and electrolytes through the so-called electric double layer (EDL). Here, improved magneto-ionic performance is achieved in electrolyte-gated cobalt oxide thin films with the addition of inorganic salts (potassium iodide, potassium chloride, and calcium tetrafluoroborate) to anhydrous propylene carbonate (PC) electrolyte. Ab initio molecular dynamics simulations of the EDL structure show that K+ is preferentially located on the cobalt oxide surface and KI (when compared to KCl) favors the accumulation of positive charge close to the surface. It is demonstrated that room temperature magneto-ionics in cobalt oxide thin films is dramatically enhanced in KI-containing PC electrolyte at an optimum concentration, leading to 11-fold increase of generated magnetization and 35-fold increase of magneto-ionic rate compared to bare PC.

Subjects

Subjects :
General Materials Science

Details

ISSN :
20556764 and 20556756
Volume :
8
Database :
OpenAIRE
Journal :
Nanoscale Horizons
Accession number :
edsair.doi.dedup.....a5454f82e0bb8775a491bd839f55967c
Full Text :
https://doi.org/10.1039/d2nh00340f