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Using resonant elastic x-ray scattering (REXS), we uncover a new spiral state confined to the surface of Cu\n                    <jats:sub>2<\/jats:sub>\n                    OSeO\n                    <jats:sub>3<\/jats:sub>\n                    . This surface-confined spiral state (SSS) displays a real-space pitch of ~ 120 nm, which remarkably is twice the length of the incommensurate structures observed to-date in Cu\n                    <jats:sub>2<\/jats:sub>\n                    OSeO\n                    <jats:sub>3<\/jats:sub>\n                    . The SSS phase emerges at temperatures below 30 K when the magnetic field is applied between 3\n                    <jats:sup>\u2218<\/jats:sup>\n                    to 18\n                    <jats:sup>\u2218<\/jats:sup>\n                    away from the \u2329110\u232a crystallographic axes. Its surface localisation is demonstrated through a combination of REXS in reflection and transmission geometries, with complementary small-angle neutron scattering measurements suggesting its absence from the bulk. We attribute the stabilisation of the SSS to competing anisotropic interactions at the crystal surface. The discovery of a robust, surface-confined spiral paves the way for engineering energy-efficient, nanoscale spin-texture platforms for next-generation devices.\n                  <\/jats:p>","DOI":"10.1038\/s41535-026-00892-6","type":"journal-article","created":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T06:57:54Z","timestamp":1779346674000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A surface-confined spiral state with the double period in the cubic chiral helimagnet Cu2OSeO3"],"prefix":"10.1038","volume":"11","author":[{"given":"Priya R.","family":"Baral","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oleg I.","family":"Utesov","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel H.","family":"Moody","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew T.","family":"Littlehales","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pierluigi","family":"Gargiani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manuel","family":"Valvidares","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Cubitt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nina-Juliane","family":"Steinke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Luo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Florin","family":"Radu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arnaud","family":"Magrez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan S.","family":"White","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victor","family":"Ukleev","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,5,21]]},"reference":[{"key":"892_CR1","doi-asserted-by":"publisher","first-page":"232","DOI":"10.1038\/s41586-020-2775-x","volume":"586","author":"T Yokouchi","year":"2020","unstructured":"Yokouchi, T. et al. 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