Tunable Magnetism in Nanoporous CuNi Alloys by Reversible Voltage-Driven Element-Selective Redox Processes

Alberto Quintana, Enric Menéndez, Eloy Isarain-Chávez, Jordina Fornell, Pau Solsona, François Fauth, Maria Dolors Baró, Josep Nogués, Eva Pellicer, Jordi Sort

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)

Abstract

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Voltage-driven manipulation of magnetism in electrodeposited 200 nm thick nanoporous single-phase solid solution Cu20Ni80 (at%) alloy films (with sub 10 nm pore size) is accomplished by controlled reduction-oxidation (i.e., redox) processes in a protic solvent, namely 1 m NaOH aqueous solution. Owing to the selectivity of the electrochemical processes, the oxidation of the CuNi film mainly occurs on the Cu counterpart of the solid solution, resulting in a Ni-enriched alloy. As a consequence, the magnetic moment at saturation significantly increases (up to 33% enhancement with respect to the as-prepared sample), while only slight changes in coercivity are observed. Conversely, the reduction process brings Cu back to its metallic state and, remarkably, it becomes alloyed to Ni again. The reported phenomenon is fully reversible, thus allowing for the precise adjustment of the magnetic properties of this system through the sign and amplitude of the applied voltage.
Original languageEnglish
Article number1704396
JournalSmall
Volume14
Issue number21
DOIs
Publication statusPublished - 24 May 2018

Keywords

  • magneto-electric effects
  • nanoporous alloys
  • redox processes

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