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To address this challenge, we introduce high-entropy metal oxides (HEMOs) into carbon-based chiral frameworks, constructing HEMO and carbon nanocoil (HEMO@CNC) composites. By combining advanced microscopy, electromagnetic measurements, and density functional theory (DFT) calculations, it is revealed that increasing entropy and helical strain jointly induce nonlinear changes in SOC strength and defect-related localized states. Benefiting from these effects, the HEMO@CNC system achieves an ultrawide bandwidth, outperforming linear structures and low-entropy systems. This work provides a potential paradigm for integrating topological defect engineering and high-entropy quantum modulation, offering deeper insights into advancing electromagnetic functional materials from macroscopic design toward geometry-defect-spin synergistic regulation.<\/jats:p>","DOI":"10.1126\/sciadv.adz2218","type":"journal-article","created":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T17:59:09Z","timestamp":1760119149000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":41,"title":["Geometry-defect-spin coupling in chiral high-entropy systems: Multiscale mechanisms of GHz electromagnetic dissipation"],"prefix":"10.1126","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-8918-9044","authenticated-orcid":true,"given":"Nan","family":"Wang","sequence":"first","affiliation":[{"name":"College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya\u2019an 625000, 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