Maximizing Exchange Bias in Co/CoO Core/Shell Nanoparticles by Lattice Matching between the Shell and the Embedding Matrix

Juan A. González, Juan P. Andrés, Ricardo López Antón, José A. De Toro, Peter S. Normile, Pablo Muniz, J. Manuel Riveiro, Josep Nogués

Research output: Contribution to journalArticleResearchpeer-review

23 Citations (Scopus)

Abstract

© 2017 American Chemical Society. The exchange bias properties of 5 nm Co/CoO ferromagnetic/antiferromagnetic core/shell nanoparticles, highly dispersed in a CuxO 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 HE = 7780 Oe and HC = 6950 Oe are linked to the presence of a Cu2O matrix (0.3% lattice mismatch with respect to the shells). The small mismatch between Cu2O 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.
Original languageEnglish
Pages (from-to)5200-5206
JournalChemistry of Materials
Volume29
Issue number12
DOIs
Publication statusPublished - 27 Jun 2017

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