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PUFs promise more robust information security than that provided by the conventional software\u2010based approaches. While silicon\u2010 and memristor\u2010based PUFs are advancing, their reliability and scalability require further improvements. These are currently limited by output fluctuations and associated additional peripherals. Here, highly reliable spintronic PUFs that exploit field\u2010free spin\u2013orbit\u2010torque switching in IrMn\/CoFeB\/Ta\/CoFeB structures are demonstrated. It is shown that the stochastic switching polarity of the perpendicular magnetization of the top CoFeB can be achieved by manipulating the exchange bias directions of the bottom IrMn\/CoFeB. This serves as an entropy source for the spintronic PUF, which is characterized by high entropy, uniqueness, reconfigurability, and digital output. Furthermore, the device ensures a zero bit\u2010error\u2010rate under repetitive operations and robustness against external magnetic fields, and offers scalable and energy\u2010efficient device implementations.<\/jats:p>","DOI":"10.1002\/adma.202203558","type":"journal-article","created":{"date-parts":[[2022,9,19]],"date-time":"2022-09-19T19:39:32Z","timestamp":1663616372000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":60,"title":["Spintronic Physical Unclonable Functions Based on Field\u2010Free Spin\u2013Orbit\u2010Torque Switching"],"prefix":"10.1002","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8142-3616","authenticated-orcid":false,"given":"Soogil","family":"Lee","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0347-5100","authenticated-orcid":false,"given":"Jaimin","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeong\u2010Mok","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Namhee","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Donghyeon","family":"Han","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taekhyeon","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Physics KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"San","family":"Ko","sequence":"additional","affiliation":[{"name":"Department of Physics KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiseok","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Physics KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sanghwa","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sungjun","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daekyu","family":"Koh","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1131-8490","authenticated-orcid":false,"given":"Min\u2010Gu","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering KAIST  Daejeon 34141 Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jisung","family":"Lee","sequence":"additional","affiliation":[{"name":"Research &amp; 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