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Here we demonstrate intrinsic exchange bias in freestanding magnetite (Fe\n                    <jats:sub>3<\/jats:sub>\n                    O\n                    <jats:sub>4<\/jats:sub>\n                    ) nanoparticles (4.0\u00a0nm), mediated by symmetry\u2010breaking Jahn\u2013Teller\u2010type lattice distortions. \u00c5ngstr\u00f6m\u2010scale symmetry\u2010lowering lattice displacements in octahedral Fe\n                    <jats:sup>2+<\/jats:sup>\n                    (3d6) modulate the local crystal field environment, induing a spin\u2010state reconfiguration from a low\u2010spin (\n                    <jats:italic>S<\/jats:italic>\n                    \u00a0= 0) toward a high\u2010spin state (\n                    <jats:italic>S<\/jats:italic>\n                    \u00a0= 1), accompanied by the breaking of magnetic space\u2010group and time\u2010reversal (\ud835\udcaf) symmetries. The high\u2010spin state couples to \ud835\udcaf\u2010symmetric antiparallel Fe\n                    <jats:sup>3+<\/jats:sup>\n                    (3d5) spins via double exchange, bypassing conventional interfacial interactions. This work establishes Jahn\u2013Teller driven symmetry breaking as a new mechanism for exchange bias in quantum\u2010confined systems, opening pathways for engineering emergent spin correlations in single\u2010phase 0D spintronic architectures with three\u2010dimensional nanoconfinement (nm\u00a0\u00d7 nm \u00d7 nm scale).\n                  <\/jats:p>","DOI":"10.1002\/anie.2461963","type":"journal-article","created":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T16:50:16Z","timestamp":1775926216000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Jahn\u2013Teller Effect Induces Exchange Bias in Ultrasmall Magnetite"],"prefix":"10.1002","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6293-988X","authenticated-orcid":false,"given":"Mengmeng","family":"Li","sequence":"first","affiliation":[{"name":"Institute of Advanced Equipment College of Energy Engineering Zhejiang University  Hangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiuyu","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Advanced Equipment College of Energy Engineering Zhejiang University  Hangzhou 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