Room-temperature multiferroicity in NiFe2O4 and its magnetoelectric coupling intensified through defect engineering

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The well-known ferromagnetic oxide, NiFe2O4, was studied as a potential candidate for room-temperature Type II magnetoelectrics. A spin canting as one of the essential requirements for Type II multiferroics was induced by breaking the stoichiometry, that is, intentionally subtracting Fe ions. We observed that Fe ions were first subtracted exclusively from the tetrahedral sites, leading to an increase in the magnetoelectric coupling owing to an increasing degree of spin canting. The enhancement in the magnetoelectric coupling culminated beyond the subtraction level of similar to 30 at.%, at which Fe ions started to be removed from the octahedral sites. Alongside, we observed that the subtraction of Fe ions gives rise to a ferroelectricity due to the formation of defect complexes that establish an internal bias field.
Publisher
WILEY
Issue Date
2021-12
Language
English
Article Type
Article
Citation

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.104, no.12, pp.6384 - 6392

ISSN
0002-7820
DOI
10.1111/jace.18012
URI
http://hdl.handle.net/10203/288165
Appears in Collection
MS-Journal Papers(저널논문)
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