Intrinsic exchange bias from interfacial reconstruction in an epitaxial NixCoyFe3-x-yO4(111)/α-Al2O3(0001) thin film family.
J Phys Condens Matter
; 36(50)2024 Sep 18.
Article
em En
| MEDLINE
| ID: mdl-39250929
ABSTRACT
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 onα-Al2O3(0001) substrates, due to the emergence of a rock-salt interfacial layer consisting of antiferromagnetic CoO from interfacial reconstruction. We show that in NixCoyFe3-x-yO4(111)/α-Al2O3(0001) films, intrinsic exchange bias and interfacial reconstruction have consistent dependences on Co concentrationy, 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.
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MEDLINE
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En
Ano de publicação:
2024
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Article