de h-Óra, M;
Nicolenco, A;
Monalisha, P;
Maity, T;
Zhu, B;
Lee, S;
Sun, Z;
... MacManus-Driscoll, J; + view all
(2023)
Highly cyclable voltage control of magnetism in cobalt ferrite nanopillars for memory and neuromorphic applications.
APL Materials
, 11
(5)
, Article 051105. 10.1063/5.0147665.
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Abstract
Tuning the properties of magnetic materials by voltage-driven ion migration (magneto-ionics) gives potential for energy-efficient, non-volatile magnetic memory and neuromorphic computing. Here, we report large changes in the magnetic moment at saturation (mS) and coercivity (HC), of 34% and 78%, respectively, in an array of CoFe2O4 (CFO) epitaxial nanopillar electrodes (∼50 nm diameter, ∼70 nm pitch, and 90 nm in height) with an applied voltage of −10 V in a liquid electrolyte cell. Furthermore, a magneto-ionic response faster than 3 s and endurance >2000 cycles are demonstrated. The response time is faster than for other magneto-ionic films of similar thickness, and cyclability is around two orders of magnitude higher than for other oxygen magneto-ionic systems. Using a range of characterization techniques, magnetic switching is shown to arise from the modulation of oxygen content in the CFO. Also, the highly cyclable, self-assembled nanopillar structures were demonstrated to emulate various synaptic behaviors, exhibiting non-volatile, multilevel magnetic states for analog computing and high-density storage. Overall, CFO nanopillar arrays offer the potential to be used as interconnected synapses for advanced neuromorphic computing applications.
| Type: | Article |
|---|---|
| Title: | Highly cyclable voltage control of magnetism in cobalt ferrite nanopillars for memory and neuromorphic applications |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1063/5.0147665 |
| Publisher version: | https://doi.org/10.1063/5.0147665 |
| Language: | English |
| Additional information: | © 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10171016 |
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