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Adv."],"published-print":{"date-parts":[[2026,7,17]]},"abstract":"<jats:p>A distinct difference between graphene\u2014an atomic layer of carbon\u2014and conventional semiconductors is that its electrons behave as massless Dirac fermions, giving rise to unprecedented physical properties. Magnetically ordered solids host magnons, quasiparticles associated with magnetic degrees of freedom. While Dirac magnons have recently been predicted in specific insulating or rare-earth magnets, their existence in thin 3d magnets remains elusive because of the complex nature of itinerant magnetism and dimensionality effects. Here, we demonstrate the presence of Dirac magnons in a thin itinerant elemental ferromagnet. By investigating atomically designed hexagonal close-packed cobalt films, we establish that magnons in such structures resemble the Dirac electrons in graphene. We explain the physical nature of these Dirac magnons and discuss the consequences of symmetry, dimensionality, magnetic interactions, the number of atomic layers, and cobalt\u2019s itinerant magnetism on the properties of the Dirac points. Our results pave the way for finding and engineering Dirac magnons in a variety of low-dimensional layered 3d ferromagnets and metamaterials.<\/jats:p>","DOI":"10.1126\/sciadv.aed9835","type":"journal-article","created":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T18:01:57Z","timestamp":1784138517000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Dirac magnons in a thin elemental itinerant ferromagnet"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4674-3446","authenticated-orcid":true,"given":"Khalil","family":"Zakeri","sequence":"first","affiliation":[{"name":"Heisenberg Spin-dynamics Group, Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-2311-9037","authenticated-orcid":true,"given":"Christopher","family":"Hins","sequence":"additional","affiliation":[{"name":"Heisenberg Spin-dynamics Group, Physikalisches Institut, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9711-3479","authenticated-orcid":true,"given":"Robin R.","family":"Neumann","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Physik, Johannes Gutenberg-Universit\u00e4t Mainz, D-55128 Mainz, Germany."},{"name":"Institut f\u00fcr Physik, Martin-Luther-Universit\u00e4t Halle-Wittenberg, D-06099 Halle (Saale), Germany."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8599-9209","authenticated-orcid":true,"given":"Alexander","family":"Mook","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Physik, Johannes Gutenberg-Universit\u00e4t Mainz, D-55128 Mainz, Germany."},{"name":"Institute of Solid State Theory, University of M\u00fcnster, 48149 M\u00fcnster, Germany."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4005-6781","authenticated-orcid":true,"given":"Arthur","family":"Ernst","sequence":"additional","affiliation":[{"name":"Institute for Theoretical Physics, Johannes Kepler University, Altenberger Strasse 69, A-4040 Linz, Austria."},{"name":"Max-Planck-Institut f\u00fcr Mikrostrukturphysik, Weinberg 2, D-06120 Halle (Saale), Germany."},{"name":"Donostia International Physics Center, Donostia-San Sebastian 20018, Gipuzkoa, Spain."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_2_2_2","first-page":"610","article-title":"Quantum mechanics of many-electron systems","volume":"117","author":"Dirac P. 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