Intrinsic exchange bias from interfacial reconstruction in an epitaxial NixCoyFe3–x–yO4(111)/α-Al2O3(0001) thin film family

Yang, Detian; Liu, Yaohua; Xu, Xiaoshan

doi:10.1088/1361-648x/ad789d

Intrinsic exchange bias from interfacial reconstruction in an epitaxial Ni_xCo_yFe_3–x–yO₄(111)/α-Al₂O₃(0001) thin film family

Journal Article · Wed Sep 18 00:00:00 EDT 2024 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648x/ad789d· OSTI ID:2455060

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Shanghai University (China); Univ. of Nebraska, Lincoln, NE (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of Nebraska, Lincoln, NE (United States)

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 α-Al₂O₃(0001) substrates, due to the emergence of a rock-salt interfacial layer consisting of antiferromagnetic CoO from interfacial reconstruction. We show that in Ni_xCo_yFe_3–x–yO₄(111)/α-Al₂O₃(0001) films, intrinsic exchange bias and interfacial reconstruction have consistent dependences on Co concentration y, 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2455060

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 50 Vol. 36; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
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exchange bias
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Intrinsic exchange bias from interfacial reconstruction in an epitaxial NixCoyFe3–x–yO4(111)/α-Al2O3(0001) thin film family

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Intrinsic exchange bias from interfacial reconstruction in an epitaxial Ni_xCo_yFe_3–x–yO₄(111)/α-Al₂O₃(0001) thin film family