Interfaceless Exchange Bias in CoFe<sub>2</sub>O<sub>4</sub> Nanocrystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 36848327.
- Also identified by DOI 10.1021/acs.nanolett.2c04268 and PMC identifier 10848284.
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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 interface, revolutionizes the established concept of exchange bias phenomenology.