Interfaceless Exchange Bias in CoFe₂O₄ Nanocrystals.

ABSTRACT: Oxidized cobalt ferrite nanocrystals with a modified distribution of the magnetic cations in their spinel structure give place to an unusual exchange-coupled system with a double reversal of the magnetization, exchange bias, and increased coercivity, but without the presence of a clear physical interface that delimits two well-differentiated magnetic phases. More specifically, the partial oxidation of cobalt cations and the formation of Fe vacancies at the surface region entail the formation of a cobalt-rich mixed ferrite spinel, which is strongly pinned by the ferrimagnetic background from the cobalt ferrite lattice. This particular configuration of exchange-biased magnetic behavior, involving two different magnetic phases but without the occurrence of a crystallographically coherent inte

SUBMITTER: Rivas-Murias B 

PROVIDER: S-EPMC10848284 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature