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Adding inorganic salts like potassium iodide to electrolytes significantly boosts magneto-ionic effects in cobalt oxide thin films. This voltage-controlled magnetism enhances spintronic devices for energy efficiency.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Magneto-ionics enables voltage-controlled magnetism for energy-efficient spintronic devices.
  • Electrolyte gating creates electric fields at material interfaces via electric double layers (EDLs).

Purpose of the Study:

  • To enhance magneto-ionic performance in cobalt oxide (Co3O4) thin films using electrolyte gating.
  • To investigate the effect of inorganic salt additives on EDL structure and magneto-ionic properties.

Main Methods:

  • Fabrication of electrolyte-gated cobalt oxide thin films.
  • Electrolyte preparation with anhydrous propylene carbonate (PC) and various inorganic salts (KI, KCl, Ca(BF4)2).
  • Ab initio molecular dynamics simulations to analyze EDL structure.
  • Magnetization measurements to quantify magneto-ionic effects.

Main Results:

  • Addition of inorganic salts, particularly potassium iodide (KI), to PC electrolyte improved magneto-ionic performance.
  • Ab initio simulations revealed preferential K+ location on the Co3O4 surface, with KI favoring positive charge accumulation.
  • Optimized KI concentration in PC electrolyte led to an 11-fold increase in magnetization and a 35-fold increase in magneto-ionic rate.

Conclusions:

  • Inorganic salt additives, especially KI, significantly enhance room-temperature magneto-ionics in cobalt oxide thin films.
  • The observed enhancement is linked to specific ion interactions and charge accumulation at the electrolyte-Co3O4 interface.
  • This work demonstrates a promising strategy for developing highly efficient voltage-controlled magnetic spintronic devices.