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Ultrathin Limit of Exchange Bias Coupling at Oxide Multiferroic/Ferromagnetic Interfaces
Author(s) -
Huijben M.,
Yu P.,
Martin L. W.,
Molegraaf H. J. A.,
Chu Y.H.,
Holcomb M. B.,
Balke N.,
Rijnders G.,
Ramesh R.
Publication year - 2013
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201300940
Subject(s) - materials science , multiferroics , ferromagnetism , exchange bias , antiferromagnetism , condensed matter physics , magnetic circular dichroism , coupling (piping) , heterojunction , oxide , linear dichroism , ferroelectricity , optoelectronics , magnetic anisotropy , circular dichroism , crystallography , magnetic field , magnetization , spectral line , composite material , chemistry , physics , quantum mechanics , astronomy , dielectric , metallurgy
Exchange bias coupling at the multiferroic‐ ferromagnetic interface in BiFeO 3 /La 0.7 Sr 0.3 MnO 3 heterostructures exhibits a critical thickness for ultrathin BiFeO 3 layers of 5 unit cells (2 nm). Linear dichroism measurements demonstrate the dependence on the BiFeO 3 layer thickness with a strong reduction for ultrathin layers, indicating diminished antiferromagnetic ordering that prevents interfacial exchange bias coupling.