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Here, we report a carbothermal\u2010reduction\u2010driven metastable engineering strategy for programmable FeNi\n                    <jats:sub>3<\/jats:sub>\n                    \u2013high\u2010entropy oxide (HEO) biphasic composites on reduced graphene oxide under low oxygen partial pressure. By tuning thermodynamic driving forces and kinetic barriers, the FeNi\n                    <jats:sub>3<\/jats:sub>\n                    metastable fraction is precisely regulated from 0% to 80.4%. Density functional theory shows that FeNi\n                    <jats:sub>3<\/jats:sub>\n                    is kinetically favored due to lower migration barriers, while HEO is thermodynamically stabilized by lower Gibbs free energy, enabling controllable phase coexistence. Fe\u2013N site modification further enhances interfacial polarization and magneto\u2010dielectric coupling, improving impedance matching and attenuation. The optimized composite achieves a minimum reflection loss of \u221250.6\u00a0dB in the Ku band at low filler loading. Integrated into flexible metamaterials, the effective absorption bandwidth expands to 35.9\u00a0GHz (4.1\u201340\u00a0GHz), with excellent mechanical flexibility and strong radar cross\u2010section reduction and radio\u2010frequency shielding. This work establishes a cross\u2010scale metastable engineering paradigm spanning carrier regulation, phase competition, and metamaterial design for high\u2010performance electromagnetic absorbers.\n                  <\/jats:p>","DOI":"10.1002\/smll.75824","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T15:08:22Z","timestamp":1790003302000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Programmable Metastable Engineering of FeNi\n                    <sub>3<\/sub>\n                    \u2013High\u2010Entropy Oxide Heterostructures for Ultrawideband Electromagnetic Absorption"],"prefix":"10.1002","author":[{"given":"Bosen","family":"Lei","sequence":"first","affiliation":[{"name":"Ministry of Education Key Laboratory for Non\u2010equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi'an Jiaotong University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siyuan","family":"Dong","sequence":"additional","affiliation":[{"name":"Ministry of Education Key Laboratory for Non\u2010equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi'an Jiaotong University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhonghua","family":"Wang","sequence":"additional","affiliation":[{"name":"China Mobile Communications Group Shaanxi Co.,Ltd.  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1816-9360","authenticated-orcid":false,"given":"Jie","family":"Han","sequence":"additional","affiliation":[{"name":"Ministry of Education Key Laboratory for Non\u2010equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi'an Jiaotong University  Xi'an China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-2154-4903","authenticated-orcid":false,"given":"Weitong","family":"Wang","sequence":"additional","affiliation":[{"name":"Ministry of Education Key Laboratory for Non\u2010equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic Physics School of Physics Xi'an Jiaotong University  Xi'an 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