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

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 obs...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2021-12, Vol.104 (12), p.6384-6392
Main Authors: Cho, Jae‐Hyeon, Cho, Seongwoo, Lee, Jun Han, Palneedi, Haribabu, Lee, Ju‐Hyeon, Kim, Hwang‐Pill, Lee, Nyun Jong, Tigunta, Siriporn, Pojprapai, Soodkhet, Kim, Sanghoon, Ryu, Jungho, Oh, Yoon Seok, Hong, Seungbum, Jo, Wook
Format: Article
Language:English
Subjects:
Coupling
Ferroelectricity
ferroelectricity/ferroelectric materials
Ferromagnetism
ferromagnetism/ferromagnetic materials
Filing
magnetoelectrics
multiferroics
Nickel ferrites
spinels
Stoichiometry
Subtraction
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Summary: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 ~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.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18012