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Structural chirality of polar skyrmions probed by resonant elastic x-ray scattering

Abstract: An escalating challenge in condensed-matter research is the characterization of emergent order-parameter nanostructures such as ferroelectric and ferromagnetic skyrmions. Their small length scales coupled with complex, three-dimensional polarization or spin structures makes them demanding to trace out fully. Resonant elastic x-ray scattering (REXS) has emerged as a technique to study chirality in spin textures such as skyrmions and domain walls. It has, however, been used to a considerably lesser extent to study analogous features in ferroelectrics. Here, we present a framework for modeling REXS from an arbitrary arrangement of charge quadrupole moments, which can be applied to nanostructures in materials such as ferroelectrics. With this, we demonstrate how extended reciprocal space scans using REXS with circularly polarized x rays can probe the three-dimensional structure and chirality of polar skyrmions. Measurements, bolstered by quantitative scattering calculations, show that polar skyrmions of mixed chirality coexist, and that REXS allows valuation of relative fractions of right- and left-handed skyrmions. Our quantitative analysis of the structure and chirality of polar skyrmions highlights the capability of REXS for establishing complex topological structures toward future application exploits.

 Autoría: McCarter M.R., Kim K.T., Stoica V.A., Das S., Klewe C., Donoway E.P., Burn D.M., Shafer P., Rodolakis F., Gonçalves M.A.P., Gómez-Ortiz F., Íñiguez J., García-Fernández P., Junquera J., Lovesey S.W., Van Der Laan G., Park S.Y., Freeland J.W., Martin L.W., Lee D.R., Ramesh R.,

 Fuente: Physical Review Letters, 2022, 129(24), 247601

 Editorial: American Physical Society

 Fecha de publicación: 05/12/2022

 Nº de páginas: 7

 Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevLett.129.247601

 ISSN: 0031-9007,1079-7114

 Proyecto español: PGC2018-096955-B-C41

 Url de la publicación: https://doi.org/10.1103/PhysRevLett.129.247601

Autoría

MCCARTER, MARGARET R

KIM, KOOK TAE

STOICA, VLADIMIR A

DAS, SUJIT

KLEWE, CHRISTOPH

DONOWAY, ELIZABETH P

BURN, DAVID M.

SHAFER, PADRAIC

RODOLAKIS, FANNY

GONÇALVES, MAURO A. P.

FERNANDO GOMEZ ORTIZ

ÍÑIGUEZ, JORGE

LOVESEY, STEPHEN W.

VAN DER LAAN, GERRIT

PARK, SE YOUNG

FREELAND, JOHN W.

MARTIN, LANE W.

LEE, DONG RYEOL