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Matter"],"published-print":{"date-parts":[[2024,12,18]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Intrinsic exchange bias is known as the unidirectional exchange anisotropy that emerges in a nominally single-component ferro-(ferri-)magnetic system. In this work, with magnetic and structural characterizations, we demonstrate that intrinsic exchange bias is a general phenomenon in (Ni, Co, Fe)-based spinel oxide films deposited on<jats:inline-formula><jats:tex-math\/><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\"><mml:mrow><mml:mi>\u03b1<\/mml:mi><\/mml:mrow><\/mml:math><\/jats:inline-formula>-Al<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>(0001) substrates, due to the emergence of a rock-salt interfacial layer consisting of antiferromagnetic CoO from interfacial reconstruction. We show that in Ni<jats:italic><jats:sub>x<\/jats:sub><\/jats:italic>Co<jats:italic><jats:sub>y<\/jats:sub><\/jats:italic>Fe<jats:sub>3\u2212<jats:italic>x<\/jats:italic>\u2212<jats:italic>y<\/jats:italic><\/jats:sub>O<jats:sub>4<\/jats:sub>(111)\/<jats:inline-formula><jats:tex-math\/><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\"><mml:mrow><mml:mi>\u03b1<\/mml:mi><\/mml:mrow><\/mml:math><\/jats:inline-formula>-Al<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>(0001) films, intrinsic exchange bias and interfacial reconstruction have consistent dependences on Co concentration<jats:italic>y<\/jats:italic>, while the Ni and Fe concentration appears to be less important. This work establishes a family of intrinsic exchange bias materials with great tunability by stoichiometry and highlights the strategy of interface engineering in controlling material functionalities.<\/jats:p>","DOI":"10.1088\/1361-648x\/ad789d","type":"journal-article","created":{"date-parts":[[2024,9,9]],"date-time":"2024-09-09T22:56:40Z","timestamp":1725922600000},"page":"505802","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Intrinsic exchange bias from interfacial reconstruction in an epitaxial Ni<sub>x<\/sub>Co<sub>y<\/sub>Fe<sub>3\u2212<\/sub><sub>x<\/sub><sub>\u2212y<\/sub>O<sub>4<\/sub>(111)\/<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mrow><mml:mi>\u03b1<\/mml:mi><\/mml:mrow><\/mml:math>-Al<sub>2<\/sub>O<sub>3<\/sub>(0001) thin film family"],"prefix":"10.1088","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8807-3041","authenticated-orcid":true,"given":"Detian","family":"Yang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5867-5065","authenticated-orcid":true,"given":"Yaohua","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4363-392X","authenticated-orcid":true,"given":"Xiaoshan","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2024,9,18]]},"reference":[{"key":"cmad789dbib1","doi-asserted-by":"publisher","first-page":"103","DOI":"10.1038\/nmat3223","article-title":"Emergent phenomena at oxide interfaces","volume":"11","author":"Hwang","year":"2012","journal-title":"Nat. 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