The antiferroelectric (AFE) phase, in which nonpolar and polar states are
switchable by an electric field, is a recent discovery in promising multiferroics of hexagonal rareearth
manganites (ferrites), h-RMn(Fe)O3. However, this phase has so far only been observed
at 60−160 K, which restricts key investigations into the microstructures and magnetoelectric
behaviors. Herein, we report the successful expansion of the AFE temperature range (10−300
K) by preparing h-DyFeO3 films through epitaxial stabilization. Room-temperature scanning
transmission electron microscopy reveals that the AFE phase originates from a nanomosaic
structure comprising AFE P3̅c1 and ferroelectric P63cm domains with small domain sizes of 1−
10 nm. The nanomosaic structure is stabilized by a low c/a ratio derived from the large ionic radius of Dy3+. Furthermore, weak
ferromagnetism and magnetocapacitance behaviors are observed. Below 10 K, the film exhibits an M-shaped magnetocapacitance
versus magnetic field curve, indicating unusual magnetoelectric coupling in the AFE phase.
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