Theoretical guidelines to create and tune electric skyrmion bubbles

Gonçalves, M. A. P.; Escorihuela-Sayalero, Carlos; Garca-Fernández, Pablo; Junquera, Javier; Íñiguez, Jorgé

doi:10.1126/sciadv.aau7023

Cited by 71 publications

(30 citation statements)

References 36 publications

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“…Furthermore, the sum of a periodic array of skyrmions and anti-vortices yields zero net chirality (blue curve; Fig. 2c), in accordance with the prediction of Poincaré-Hopf theorem [8,9].…”

Section: E and G)supporting

confidence: 82%

Mapping Topological Dipole Textures, Chirality, and the Potential Energy Landscape of Polar Skyrmions Using 4D-STEM

Shao

Das

et al. 2020

Microsc Microanal

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“…Furthermore, the sum of a periodic array of skyrmions and anti-vortices yields zero net chirality (blue curve; Fig. 2c), in accordance with the prediction of Poincaré-Hopf theorem [8,9].…”

Section: E and G)supporting

confidence: 82%

Mapping Topological Dipole Textures, Chirality, and the Potential Energy Landscape of Polar Skyrmions Using 4D-STEM

Shao

Das

et al. 2020

Microsc Microanal

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“…In the past 10 years, an intriguing query in ferroelectricity studies has been the existence of topological arrangement of electric dipoles such as vortices and skyrmions in magnetic systems [1][2][3][4][5][6][7][8][9][10] . These topological objects hold considerable interests from both fundamental and practical aspects.…”

Section: Introductionmentioning

confidence: 99%

Oxygen vacancy-induced topological nanodomains in ultrathin ferroelectric films

et al. 2021

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Oxygen vacancy in oxide ferroelectrics can be strongly coupled to the polar order via local strain and electric fields, thus holding the capability of producing and stabilizing exotic polarization patterns. However, despite intense theoretical studies, an explicit microscopic picture to correlate the polarization pattern and the distribution of oxygen vacancies remains absent in experiments. Here we show that in a high-quality, uniaxial ferroelectric system, i.e., compressively strained BaTiO3 ultrathin films (below 10 nm), nanoscale polarization structures can be created by intentionally introducing oxygen vacancies in the film while maintaining structure integrity (namely no extended lattice defects). Using scanning transmission electron microscopy, we reveal that the nanodomain is composed of swirling electric dipoles in the vicinity of clustered oxygen vacancies. This finding opens a new path toward the creation and understanding of the long-sought topological polar objects such as vortices and skyrmions.

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“…It turns out that these walls can harbour polarization components perpendicular to those in adjacent domains, reminiscent of boundaries called Néel and Bloch walls in ferromagnets. Therefore, if a ferroelectric domain wall is looped, it can form a ring of polarization 14 (Fig. 1b).…”

Section: Electrifying Skyrmion Bubblesmentioning

confidence: 99%

“…Crucially, unlike spins, electric dipoles can grow and shrink in magnitude, or even disappear entirely. This property might have other implications for the stability of polar-skyrmion bubbles; these require further investigation 7,14 .…”

Section: Electrifying Skyrmion Bubblesmentioning

confidence: 99%