Coercivity Modulation in Fe-Cu Pseudo-Ordered Porous Thin Films Controlled by an Applied Voltage : A Sustainable, Energy-Efficient Approach to Magnetoelectrically Driven Materials
Dislaki, Evangelia (Universitat Autònoma de Barcelona. Departament de Física)
Robbennolt, Shauna (Universitat Autònoma de Barcelona. Departament de Física)
Campoy-Quiles, Mariano (Institut de Ciència de Materials de Barcelona)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2018
Abstract:	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.
Grants:	European Commission 642642 Ministerio de Economía y Competitividad MAT2017-86357-C3-1-R Ministerio de Economía y Competitividad MAT2015-70850-P Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 European Commission 648454 European Commission 648901 Ministerio de Economía y Competitividad RYC-2012-10839 Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Coercivity ; Colloidal templating ; Electrodeposition ; Hierarchical porosity ; Magnetoelectric effects ; Voltage-driven effects
Published in:	Advanced science, Vol. 5, Issue 8 (August 2018) , art. 1800499, ISSN 2198-3844

DOI: 10.1002/advs.201800499
PMID: 30128259

8 p, 2.1 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3) > SPIN-PORICS
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles