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An OFF\/ON resistance ratio of \u224883 and a high ON state current density of \u22485\u00a0A\/cm\n                    <jats:sup>2<\/jats:sup>\n                    , important for fast device readout, is achieved through ferroelectric polarization switching, which causes electron accumulation and depletion in the adjacent LSMO electrode. Oxygen vacancy movement inside the HfO\n                    <jats:sub>2<\/jats:sub>\n                    is observed, but plays at most a minor role for switching. The devices show stable switching endurance of over 10\n                    <jats:sup>6<\/jats:sup>\n                    switching cycles, low write voltages of \u00b13\u00a0V, both outperforming previous epitaxial HfO\n                    <jats:sub>2<\/jats:sub>\n                    FTJs, 16 measured resistance states, and neuromorphic capability by voltage pulse trains and spike\u2010timing\u2010dependent plasticity. This strong performance is achieved by designing ferroelectric tunnel junctions at the materials level of undoped HfO\n                    <jats:sub>2,<\/jats:sub>\n                    which has a higher tunneling probability than HZO and a stabilized oxygen distribution. The resulting device design shows great promise for neuromorphic and analog memory applications.\n                  <\/jats:p>","DOI":"10.1002\/adfm.74667","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T18:04:29Z","timestamp":1772993069000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Achieving High ON State Current through Ferroelectric Polarization\u2010Dependent Interfacial Resistance Switching in Undoped Orthorhombic HfO\n                    <sub>2<\/sub>\n                    Films"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5811-5228","authenticated-orcid":false,"given":"Markus","family":"Hellenbrand","sequence":"first","affiliation":[{"name":"Department of Materials Science and Metallurgy University of Cambridge  Cambridge UK"}]},{"given":"Nuno","family":"Estr\u00f3cio","sequence":"additional","affiliation":[{"name":"Physics Center of Minho and Porto Universities (CF\u2010UM\u2010UP) University of Minho, Campus de Gualtar  Braga Portugal"},{"name":"Laboratory of Physics for Materials and Emergent Technologies LapMET University of Minho  Braga Portugal"}]},{"given":"Ji S.","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Metallurgy University of Cambridge  Cambridge UK"}]},{"given":"Babak","family":"Bakhit","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Metallurgy University of Cambridge  Cambridge UK"}]},{"given":"Marian C.","family":"Istrate","sequence":"additional","affiliation":[{"name":"National Institute of Materials Physics  Magurele Romania"}]},{"given":"Corneliu","family":"Ghica","sequence":"additional","affiliation":[{"name":"National Institute of Materials Physics  Magurele Romania"}]},{"given":"Tiago","family":"Rebelo","sequence":"additional","affiliation":[{"name":"Physics Center of Minho and Porto Universities (CF\u2010UM\u2010UP) University of Minho, Campus de Gualtar  Braga Portugal"}]},{"given":"Nives","family":"Strkalj","sequence":"additional","affiliation":[{"name":"Center for Advanced Laser Techniques Institute of Physics  Zagreb Croatia"}]},{"given":"Abin","family":"Varghese","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Metallurgy University of Cambridge  Cambridge UK"},{"name":"Department of Engineering Faculty of Natural Mathematical &amp; Engineering Sciences King's College London  Strand London UK"}]},{"given":"Bernardo","family":"Almeida","sequence":"additional","affiliation":[{"name":"Physics Center of Minho and Porto Universities (CF\u2010UM\u2010UP) University of Minho, Campus de Gualtar  Braga Portugal"},{"name":"Laboratory of Physics for Materials and Emergent Technologies LapMET University of Minho  Braga Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7477-6934","authenticated-orcid":false,"given":"Lu\u00eds S.","family":"Marques","sequence":"additional","affiliation":[{"name":"Physics Center of Minho and Porto Universities (CF\u2010UM\u2010UP) University of Minho, Campus de Gualtar  Braga Portugal"},{"name":"Laboratory of Physics for Materials and Emergent Technologies LapMET University of Minho  Braga Portugal"}]},{"given":"Bipin","family":"Rajendran","sequence":"additional","affiliation":[{"name":"Department of Engineering Faculty of Natural Mathematical &amp; Engineering Sciences King's College London  Strand London UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4987-6620","authenticated-orcid":false,"given":"Judith L.","family":"MacManus\u2010Driscoll","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Metallurgy University of Cambridge  Cambridge UK"}]},{"given":"Jos\u00e9 P. 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