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Herein, super\u2010dispersed MnO protrusions and Ni particles were confined within a carbon matrix, constructing unique Ni\u2010MnO\/C microspheres via a pyrolysis\u2010controlled strategy. Leveraging differences in oxygen affinity, MnO protrusions and Ni particles with tunable dispersity, size, and content were systematically achieved, enabling precise regulation of dielectric behaviors and EM wave absorption. The optimized Ni\u2010MnO\/C composite achieved an outstanding minimum reflection loss of \u201051.49\u00a0dB and a maximum effective absorption bandwidth (EAB) of 5.20\u00a0GHz. Significantly, by further integrating the composite into metamaterial designs and heat\u2010transfer flexible films, the EAB was dramatically broadened to 12.28\u00a0GHz, and thermal insulation was realized. This work introduces a morphological\u2010engineering strategy that not only overcomes the dispersion\u2010control bottleneck in heterojunctions design but also bridges the gap between microstructural tailoring and practical device applications, offering a new idea for high\u2010performance EM wave absorption materials.<\/jats:p>","DOI":"10.1002\/smtd.71130","type":"journal-article","created":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T11:04:05Z","timestamp":1791975845000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Magnetic\u2010Dielectric Heterojunctions Regulation in Ni\u2010MnO\/C Microspheres With Tunable Electromagnetic Wave Absorption"],"prefix":"10.1002","author":[{"given":"Zhikai","family":"Yan","sequence":"first","affiliation":[{"name":"School of Materials and Chemistry University of Shanghai for Science and Technology  Shanghai 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