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Highly cyclable voltage control of magnetism in cobalt ferrite nanopillars for memory and neuromorphic applications

Title
Highly cyclable voltage control of magnetism in cobalt ferrite nanopillars for memory and neuromorphic applications
Author(s)
de h-Ora, MuireannNicolenco, AlionaMonalisha, P.Maity, TuhinZhu, BonanLee, ShinbuhmSun, ZhuotongSort, JordiMacManus-Driscoll, Judith
Issued Date
2023-05
Citation
APL Materials, v.11, no.5
Type
Article
Keywords
TRANSITIONMAGNETIZATION
ISSN
2166-532X
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. © 2023 Author(s).
URI
http://hdl.handle.net/20.500.11750/46215
DOI
10.1063/5.0147665
Publisher
American Institute of Physics Inc.
Related Researcher
  • 이신범 Lee, Shinbuhm 화학물리학과
  • Research Interests Multifunctional films; Experimental condensed matter physics
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Appears in Collections:
Department of Physics and Chemistry Multifunctional films and nanostructures Lab 1. Journal Articles

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