TY - JOUR
T1 - Tunable Magnetism in Nanoporous CuNi Alloys by Reversible Voltage-Driven Element-Selective Redox Processes
AU - Quintana, Alberto
AU - Menéndez, Enric
AU - Isarain-Chávez, Eloy
AU - Fornell, Jordina
AU - Solsona, Pau
AU - Fauth, François
AU - Baró, Maria Dolors
AU - Nogués, Josep
AU - Pellicer, Eva
AU - Sort, Jordi
PY - 2018/5/24
Y1 - 2018/5/24
N2 - © 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.
AB - © 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.
KW - magneto-electric effects
KW - nanoporous alloys
KW - redox processes
U2 - https://doi.org/10.1002/smll.201704396
DO - https://doi.org/10.1002/smll.201704396
M3 - Article
VL - 14
JO - Small
JF - Small
SN - 1613-6810
IS - 21
M1 - 1704396
ER -