Strain‐driven Switching Between Antiferromagnetic States in Frustrated Antiferromagnet UO2 Probed by Exchange Bias Effect

Frustrated antiferromagnets offer a captivating platform to study the intricate relationship of magnetic interactions, geometric constraints, and emergent phenomena. By controlling spin orientations, these materials can be tailored for applications in spintronics and quantum information processing....

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Bibliographic Details
Published in:Advanced functional materials 2024-03, Vol.34 (13)
Main Authors: Evgenia A Tereshina‐Chitrova, Pourovskii, Leonid V, Khmelevskyi, Sergii, Horak, Lukas, Bao, Zhaohui, Mackova, Anna, Malinsky, Petr, Gouder, Thomas, Caciuffo, Roberto
Format: Article
Language:English
Subjects:
Anisotropy
Antiferromagnetism
Bias
Condensed Matter
Data processing
Distortion
Exchanging
First principles
Geometric constraints
Heterostructures
Iron oxides
Magnetic moments
Materials Science
Physics
Quantum phenomena
Spintronics
Strongly Correlated Electrons
Substrates
Uranium dioxide
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Summary:Frustrated antiferromagnets offer a captivating platform to study the intricate relationship of magnetic interactions, geometric constraints, and emergent phenomena. By controlling spin orientations, these materials can be tailored for applications in spintronics and quantum information processing. The research focuses on the interplay of magnetic and exchange anisotropy effects in artificial heterostructures based on a canonical frustrated antiferromagnet, UO2. The potential to manipulate the spin directions in this material and switch between distinct antiferromagnetic (AFM) states is investigated using substrate‐induced strain. The phenomenon is probed using exchange bias effects in stoichiometric UO2/Fe3O4 bilayers. By employing many‐body first‐principles calculations magnetic configurations in the UO2 layers are identified. Even a minor tetragonal distortion triggers a transition between AFM states of different symmetries, driven by a robust alteration of single‐ion anisotropy due to the distortion. Consequently, this change influences the arrangement of magnetic moments at the UO2/Fe3O4 interface, affecting the magnitude of exchange bias. The findings showcase how epitaxial strain can effectively manipulate the AFM states in frustrated antiferromagnets by controlling single‐site anisotropy.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202311895