Reversible, electric-field induced magneto-tonic control of magnetism in mesoporous cobalt ferrite thin films
Robbennolt, Shauna (Universitat Autònoma de Barcelona. Departament de Física)
Menéndez Dalmau, Enric (Universitat Autònoma de Barcelona. Departament de Física)
Quintana Puebla, Alberto (Universitat Autònoma de Barcelona. Departament de Física)
Gómez, Andrés (Institut de Ciència de Materials de Barcelona)
Auffret, Stéphane (Centre National de la Recherche Scientifique (França))
Baltz, Vincent (Centre National de la Recherche Scientifique (França))
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2019
Abstract:	The magnetic properties of mesoporous cobalt ferrite films can be largely tuned by the application of an electric field using a liquid dielectric electrolyte. By applying a negative voltage, the cobalt ferrite becomes reduced, leading to an increase in saturation magnetization of 15% (M) and reduction in coercivity (H) between 5-28%, depending on the voltage applied (−10 V to −50 V). These changes are mainly non-volatile so after removal of −10 V M remains 12% higher (and H 5% smaller) than the pristine sample. All changes can then be reversed with a positive voltage to recover the initial properties even after the application of −50 V. Similar studies were done on analogous films without induced porosity and the effects were much smaller, underscoring the importance of nanoporosity in our system. The different mechanisms possibly responsible for the observed effects are discussed and we conclude that our observations are compatible with voltage-driven oxygen migration (i. e. , the magneto-ionic effect).
Grants:	European Commission 665919 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-292 European Commission 648454 Ministerio de Economía y Competitividad MAT2017-86357-C3-1-R Ministerio de Economía y Competitividad RYC-2012-10839
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:	Chemical physics ; Magnetic properties and materials
Published in:	Scientific reports, Vol. 9 (July 2019) , art. 10804, ISSN 2045-2322

DOI: 10.1038/s41598-019-46618-6
PMID: 31346196

14 p, 5.1 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
Articles > Research articles
Articles > Published articles