Enhancing magneto-ionic effects in magnetic nanostructured films via conformal deposition of nanolayers with oxygen acceptor/donor capabilities
Navarro Senent, Cristina (Universitat Autònoma de Barcelona. Departament de Física)
Quintana Puebla, Alberto (Universitat Autònoma de Barcelona. Departament de Física)
Isarain-Chávez, Eloy (Universitat Autònoma de Barcelona. Departament de Física)
Weschke, Eugen (Helmholtz-Zentrum Berlin für Materialien und Energie (Germany))
Yu, Pengmei (Institut de Ciència de Materials de Barcelona)
Coll, Mariona (Institut de Ciència de Materials de Barcelona)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)
Menéndez Dalmau, Enric (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)

Data:	2020
Resum:	Effective manipulation of the magnetic properties of nanostructured metallic alloys, exhibiting intergrain porosity (i. e. , channels) and conformally coated with insulating oxide nanolayers, with an electric field is demonstrated. Nanostructured Co-Pt films are grown by electrodeposition (ED) and subsequently coated with either AlOx or HfOx by atomic layer deposition (ALD) to promote magneto-ionic effects (i. e. , voltage-driven ion migration) during electrolyte gating. Pronounced variations in coercivity (HC) and magnetic moment at saturation (mS) are found at room temperature after biasing the heterostructures. The application of a negative voltage results in a decrease of HC and an increase of mS, whereas the opposite trend is achieved for positive voltages. Although magneto-ionic phenomena are already observed in uncoated Co-Pt films (because of the inherent presence of oxygen), the ALD oxide nanocoatings serve to drastically enhance the magneto-ionic effects because of partially reversible oxygen migration, driven by voltage, across the interface between AlOx or HfOx and the nanostructured Co-Pt film. Co-Pt/HfOx heterostructures exhibit the most significant magneto-electric response at negative voltages, with an increase of mS up to 76% and a decrease of HC by 58%. The combination of a nanostructured magnetic alloy and a skinlike insulating oxide nanocoating is shown to be appealing to enhance magneto-ionic effects, potentially enabling electrolyte-gated magneto-ionic technology.
Ajuts:	European Commission 648454 Ministerio de Economía y Competitividad MAT2017-86357-C3-1-R Ministerio de Economía y Competitividad MAT2017-83169-R Ministerio de Economía y Competitividad SEV-2015-0496 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1519 European Commission 665919
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Magneto-ionic effects ; Ion migration ; Voltage control of magnetism ; Co−Pt ; Nanostructured material
Publicat a:	ACS applied materials & interfaces, Vol. 12, Issue 12 (March 2020) , p. 14484-14494, ISSN 1944-8252

DOI: 10.1021/acsami.9b19363

Postprint 38 p, 2.1 MB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Grup de nanoenginyeria de materials, nanomagnetisme i nanomecànica (Gnm3) > SPIN-PORICS
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