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. 2013 Sep 14;25(34):4739-45.
doi: 10.1002/adma.201300940. Epub 2013 Jul 12.

Ultrathin limit of exchange bias coupling at oxide multiferroic/ferromagnetic interfaces

M Huijben  1 , P Yu, L W Martin, H J A Molegraaf, Y-H Chu, M B Holcomb, N Balke, G Rijnders, R Ramesh
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Free article

Ultrathin limit of exchange bias coupling at oxide multiferroic/ferromagnetic interfaces

M Huijben et al. Adv Mater. .
Free article

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.

Keywords: exchange bias; ferromagnet; interface; multiferroic; oxide heterostructure.

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