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2015 ; 6
(ä): 8542
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Discovery of stable skyrmionic state in ferroelectric nanocomposites
#MMPMID26436432
Nahas Y
; Prokhorenko S
; Louis L
; Gui Z
; Kornev I
; Bellaiche L
Nat Commun
2015[Oct]; 6
(ä): 8542
PMID26436432
show ga
Non-coplanar swirling field textures, or skyrmions, are now widely recognized as
objects of both fundamental interest and technological relevance. So far,
skyrmions were amply investigated in magnets, where due to the presence of chiral
interactions, these topological objects were found to be intrinsically
stabilized. Ferroelectrics on the other hand, lacking such chiral interactions,
were somewhat left aside in this quest. Here we demonstrate, via the use of a
first-principles-based framework, that skyrmionic configuration of polarization
can be extrinsically stabilized in ferroelectric nanocomposites. The interplay
between the considered confined geometry and the dipolar interaction underlying
the ferroelectric phase instability induces skyrmionic configurations. The
topological structure of the obtained electrical skyrmion can be mapped onto the
topology of domain-wall junctions. Furthermore, the stabilized electrical
skyrmion can be as small as a few nanometers, thus revealing prospective
skyrmion-based applications of ferroelectric nanocomposites.