Tunable Magnetism in Nanoporous CuNi Alloys by Reversible Voltage‐Driven Element‐Selective Redox Processes |
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Authors: | Alberto Quintana Enric Menéndez Eloy Isarain‐Chávez Jordina Fornell Pau Solsona François Fauth Maria Dolors Baró Josep Nogués Eva Pellicer Jordi Sort |
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Affiliation: | 1. Departament de Física, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Barcelona, Spain;2. CELLS‐ALBA, Barcelona, Spain;3. Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Cerdanyola del Vallès, Barcelona, Spain;4. Institució Catalana de Recerca i Estudis Avan?ats (ICREA), Barcelona, Spain |
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Abstract: | 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. |
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Keywords: | magneto‐electric effects nanoporous alloys redox processes |
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