Voltage-induced coercivity reduction in nanoporous alloy films

Magnetic data storage and magnetically actuated devices are conventionally controlled by magnetic fields generated using electric currents. This involves significant power dissipation by Joule heating effect. To optimize energy efficiency, manipulation of magnetic information with lower magnetic fie...

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Detalles Bibliográficos
Autores: Quintana, Alberto|||0000-0002-9813-735X, Zhang, Jin, Isarain-Chávez, Eloy|||0000-0002-4154-1343, Menéndez, Enric|||0000-0003-3809-2863, Quadrado del Burgo, Ramón|||0000-0002-8344-2319, Robles, Roberto|||0000-0001-7808-0395, Baró, M. D.|||0000-0002-8636-1063, Guerrero, Miguel|||0000-0001-8350-8261, Pané i Vidal, Salvador|||0000-0003-0147-8287, Nelson, Bradley J.|||0000-0001-9070-6987, Muller Jevenois, Carlos, Ordejon, Pablo|||0000-0002-2353-2793, Nogués, Josep|||0000-0003-4616-1371, Pellicer, Eva|||0000-0002-8901-0998, Sort, Jordi|||0000-0003-1213-3639
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:189217
Acceso en línea:https://ddd.uab.cat/record/189217
https://dx.doi.org/urn:doi:10.1002/adfm.201701904
Access Level:acceso abierto
Palabra clave:Coercivity
Energy efficiency
Magnetic actuation
Magnetoelectric effects
Nanoporous alloys
Descripción
Sumario:Magnetic data storage and magnetically actuated devices are conventionally controlled by magnetic fields generated using electric currents. This involves significant power dissipation by Joule heating effect. To optimize energy efficiency, manipulation of magnetic information with lower magnetic fields (i.e., lower electric currents) is desirable. This can be accomplished by reducing the coercivity of the actuated material. Here, a drastic reduction of coercivity is observed at room temperature in thick (≈600 nm), nanoporous, electrodeposited Cu-Ni films by simply subjecting them to the action of an electric field. The effect is due to voltage-induced changes in the magnetic anisotropy. The large surface-area-to-volume ratio and the ultranarrow pore walls of the system allow the whole film, and not only the topmost surface, to effectively contribute to the observed magnetoelectric effect. This waives the stringent "ultrathin-film requirement" from previous studies, where small voltage-driven coercivity variations were reported. This observation expands the already wide range of applications of nanoporous materials (hitherto in areas like energy storage or catalysis) and it opens new paradigms in the fields of spintronics, computation, and magnetic actuation in general.

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