Large Magnetoelectric Effects in Electrodeposited Nanoporous Microdisks Driven by Effective Surface Charging and Magneto-Ionics

Cristina Navarro-Senent, Jordina Fornell, Eloy Isarain-Chávez, Alberto Quintana, Enric Menéndez, Michael Foerster, Lucía Aballe, Eugen Weschke, Josep Nogués, Eva Pellicer, Jordi Sort

Research output: Contribution to journalArticleResearch

25 Citations (Scopus)


Copyright © 2018 American Chemical Society. A synergetic approach to enhance magnetoelectric effects (i.e., control of magnetism with voltage) and improve energy efficiency in magnetically actuated devices is presented. The investigated material consists of an ordered array of Co-Pt microdisks, in which nanoporosity and partial oxidation are introduced during the synthetic procedure to synergetically boost the effects of electric field. The microdisks are grown by electrodeposition from an electrolyte containing an amphiphilic polymeric surfactant. The bath formulation is designed to favor the incorporation of oxygen in the form of cobalt oxide. A pronounced reduction of coercivity (88%) and a remarkable increase of Kerr signal amplitude (60%) are observed at room temperature upon subjecting the microdisks to negative voltages through an electrical double layer. These large voltage-induced changes in the magnetic properties of the microdisks are due to (i) the high surface-area-to-volume ratio with ultranarrow pore walls (sub-10 nm) that promote enhanced electric charge accumulation and (ii) magneto-ionic effects, where voltage-driven O 2- migration promotes a partial reduction of CoO to Co at room temperature. This simple and versatile procedure to fabricate patterned "nano-in-micro" magnetic motifs with adjustable voltage-driven magnetic properties is very appealing for energy-efficient magnetic recording systems and other magnetoelectronic devices. ©
Original languageEnglish
Pages (from-to)44897-44905
JournalACS Applied Materials & Interfaces
Publication statusPublished - 26 Dec 2018


  • Co-Pt alloy
  • magneto-ionic effects
  • magnetoelectric actuation
  • nanoporous material
  • patterned microstructures


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