Maximizing Exchange Bias in Co/CoO Core/Shell Nanoparticles by Lattice Matching between the Shell and the Embedding Matrix
Gonzalez, Juan Antonio (Instituto Regional de Investigación Científica Aplicada)
Andrés González, Juan Pedro (Instituto Regional de Investigación Científica Aplicada)
López Antón, Ricardo (Instituto Regional de Investigación Científica Aplicada)
De Toro, José A. (Instituto Regional de Investigación Científica Aplicada)
Normile, Peter S. (Instituto Regional de Investigación Científica Aplicada)
Muñiz, Pablo (Instituto Regional de Investigación Científica Aplicada)
Riveiro, J. Manuel (Instituto Regional de Investigación Científica Aplicada)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)

Date:	2017
Abstract:	The exchange bias properties of 5 nm Co/CoO ferromagnetic/antiferromagnetic core/shell nanoparticles, highly dispersed in a CuO matrix, have been optimized by matching the lattice parameter of the matrix with that of the CoO shell. Exchange bias and coercivity fields as large as H = 7780 Oe and H = 6950 Oe are linked to the presence of a CuO matrix (0. 3% lattice mismatch with respect to the shells). The small mismatch between CuO and CoO plays a dual role: it (i) structurally stabilizes the CoO and (ii) favors the existence of a large amount of uncompensated moments in the shell that enhance the exchange bias effects. The results indicate that lattice matching may be a very efficient way to improve the exchange bias properties of core/shell nanoparticles, paving the way to novel approaches to tune their magnetic properties.
Grants:	Ministerio de Economía y Competitividad MAT2011-26207 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015 Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Coercivity field ; Core/shell nanoparticles ; Dual role ; Embedding matrices ; Exchange bias ; Exchange bias effects ; Large amounts ; Lattice matching
Published in:	Chemistry of materials, Vol. 29, Issue 12 (June 2017) , p. 5200-5206, ISSN 1520-5002

DOI: 10.1021/acs.chemmater.7b00868

Preprint 8 p, 813.8 KB

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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