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Emergent chirality in a polar meron to skyrmion phase transition

Abstract: Polar skyrmions are predicted to emerge from the interplay of elastic, electrostatic and gradient energies, in contrast to the key role of the anti-symmetric Dzyalozhinskii-Moriya interaction in magnetic skyrmions. Here, we explore the reversible transition from a skyrmion state (topological charge of -1) to a two-dimensional, tetratic lattice of merons (with topological charge of -1/2) upon varying the temperature and elastic boundary conditions in [(PbTiO3)16/(SrTiO3)16]8 membranes. This topological phase transition is accompanied by a change in chirality, from zero-net chirality (in meronic phase) to net-handedness (in skyrmionic phase). We show how scanning electron diffraction provides a robust measure of the local polarization simultaneously with the strain state at sub-nm resolution, while also directly mapping the chirality of each skyrmion. Using this, we demonstrate strain as a crucial order parameter to drive isotropic-to-anisotropic structural transitions of chiral polar skyrmions to non-chiral merons, validated with X-ray reciprocal space mapping and phase-field simulations.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Shao Y.T., Das S., Hong Z., Xu R., Chandrika S., Gómez-Ortiz F., García-Fernández P., Chen L.Q., Hwang H.Y., Junquera J., Martin L.W., Ramesh R., Muller D.A.,

 Fuente: Nature Communications, 2023, 14, 1355

Editorial: Nature Publishing Group

 Fecha de publicación: 01/12/2023

Nº de páginas: 9

Tipo de publicación: Artículo de Revista

 DOI: 10.1038/s41467-023-36950-x

ISSN: 2041-1723

 Proyecto español: PGC2018-096955-B-C41

Url de la publicación: https://doi.org/10.1038/s41467-023-36950-x

Autoría

SHAO, YU-TSUN

DAS, SUJIT

HONG, ZIJIAN

XU, RUIJUAN

CHANDRIKA, SWATHI

FERNANDO GOMEZ ORTIZ

CHEN, LONG-QING

MARTIN, LANE W.

RAMESH, RAMAMOORTHY

MULLER, DAVID A.