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Wiley, Advanced Materials, 34(25), p. 4739-4745, 2013

DOI: 10.1002/adma.201300940

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Ultrathin Limit of Exchange Bias Coupling at Oxide Multiferroic/Ferromagnetic Interfaces

Journal article published in 2013 by M. Huijben, P. Yu, L. W. Martin, H. J. A. Molegraaf, Y.-H. Chu ORCID, M. B. Holcomb ORCID, N. Balke ORCID, G. Rijnders, R. Ramesh
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Abstract

Exchange bias coupling at the multiferroic- ferromagnetic interface in BiFeO3 /La0.7 Sr0.3 MnO3 heterostructures exhibits a critical thickness for ultrathin BiFeO3 layers of 5 unit cells (2 nm). Linear dichroism measurements demonstrate the dependence on the BiFeO3 layer thickness with a strong reduction for ultrathin layers, indicating diminished antiferromagnetic ordering that prevents interfacial exchange bias coupling.