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Typically, skyrmions form in bulk crystals with reduced symmetry or ultrathin film multilayers involving heavy metals. Here, the formation of fractional Bloch skyrmion tubes at room temperature is demonstrated by 3D printing ferromagnetic double\u2010helix nanowires with two regions of opposite chirality. Using X\u2010ray microscopy and micromagnetic simulations, it is shown that the coexistence of vortex and anti\u2010parallel spin states induces the formation of fractional skyrmion tubes at zero magnetic fields, minimizing the energy cost of breaking the coupling between geometric and magnetic chirality. Control over zero\u2010field states is also demonstrated, including pure vortex, or mixed skyrmion\u2010vortex states, highlighting the magnetic reconfigurability of these 3D nanowires. This work shows how interfacing chiral geometries at the nanoscale can enable advanced forms of topological spintronics.<\/jats:p>","DOI":"10.1002\/adfm.202501615","type":"journal-article","created":{"date-parts":[[2025,4,15]],"date-time":"2025-04-15T06:12:37Z","timestamp":1744697557000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Fractional Skyrmion Tubes in Chiral\u2010Interfaced 3D Magnetic Nanowires"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7527-7034","authenticated-orcid":false,"given":"John","family":"Fullerton","sequence":"first","affiliation":[{"name":"Materials Science Division Argonne National Laboratory  Lemont IL 60439 USA"},{"name":"SUPA School of Physics and Astronomy University of Glasgow  Glasgow G12 8QQ UK"}]},{"given":"Na\u00ebmi","family":"Leo","sequence":"additional","affiliation":[{"name":"Institute of Applied Physics TU Wien  Vienna 1040 Austria"},{"name":"Department of Physics School of Science University of Loughborough  Loughborough LE11 3TU UK"}]},{"given":"Jakub","family":"Jurczyk","sequence":"additional","affiliation":[{"name":"Institute of Applied Physics TU Wien  Vienna 1040 Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9942-2419","authenticated-orcid":false,"given":"Claire","family":"Donnelly","sequence":"additional","affiliation":[{"name":"Max Planck Institute for Chemical Physics of Solids  01187 Dresden Germany"},{"name":"International Institute for Sustainability with Knotted Chiral Meta Matter (WPI\u2010SKCM2) Hiroshima University  Hiroshima 739\u20100046 Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5552-8836","authenticated-orcid":false,"given":"D\u00e9dalo","family":"Sanz\u2010Hern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Laboratoire Albert Fert CNRS Thales Universit\u00e9 Paris\u2010Saclay  Palaiseau 91767 France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2169-3008","authenticated-orcid":false,"given":"Luka","family":"Skoric","sequence":"additional","affiliation":[{"name":"Cavendish Laboratory University of Cambridge  Cambridge CB3 0HE UK"}]},{"given":"Nicholas","family":"Mille","sequence":"additional","affiliation":[{"name":"Synchrotron SOLEIL  Saint\u2010Aubin 91190 France"}]},{"given":"Stefan","family":"Stanescu","sequence":"additional","affiliation":[{"name":"Synchrotron SOLEIL  Saint\u2010Aubin 91190 France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0641-686X","authenticated-orcid":false,"given":"Donald A","family":"MacLaren","sequence":"additional","affiliation":[{"name":"SUPA School of Physics and Astronomy University of Glasgow  Glasgow G12 8QQ UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2218-7481","authenticated-orcid":false,"given":"Rachid","family":"Belkhou","sequence":"additional","affiliation":[{"name":"Synchrotron SOLEIL  Saint\u2010Aubin 91190 France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6600-7801","authenticated-orcid":false,"given":"Aurelio","family":"Hierro\u2010Rodriguez","sequence":"additional","affiliation":[{"name":"Depto. 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