Coercivity Modulation in Fe–Cu Pseudo-Ordered Porous Thin Films Controlled by an Applied Voltage: A Sustainable, Energy-Efficient Approach to Magnetoelectrically Driven Materials

Evangelia Dislaki, Shauna Robbennolt, Mariano Campoy-Quiles, Josep Nogués, Eva Pellicer, Jordi Sort

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

Abstract

© 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Fe–Cu films with pseudo-ordered, hierarchical porosity are prepared by a simple, two-step procedure that combines colloidal templating (using sub-micrometer-sized polystyrene spheres) with electrodeposition. The porosity degree of these films, estimated by ellipsometry measurements, is as high as 65%. The resulting magnetic properties can be controlled at room temperature using an applied electric field generated through an electric double layer in an anhydrous electrolyte. This material shows a remarkable 25% voltage-driven coercivity reduction upon application of negative voltages, with excellent reversibility when a positive voltage is applied, and a short recovery time. The pronounced reduction of coercivity is mainly ascribed to electrostatic charge accumulation at the surface of the porous alloy, which occurs over a large fraction of the electrodeposited material due to its high surface-area-to-volume ratio. The emergence of a hierarchical porosity is found to be crucial because it promotes the infiltration of the electrolyte into the structure of the film. The observed effects make this material a promising candidate to boost energy efficiency in magnetoelectrically actuated devices.
Original languageEnglish
Article number1800499
JournalAdvanced Science
Volume5
Issue number8
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • coercivity
  • colloidal templating
  • electrodeposition
  • hierarchical porosity
  • magnetoelectric effects
  • voltage-driven effects

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