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Electric Polarity‐Dependent Modification of the Fe/BaTiO 3 Interface
Author(s) -
Bisht Manisha,
Couet Sebastien,
Lazenka Vera,
Modarresi Hiwa,
Rüffer Rudolf,
Locquet JeanPierre,
Van Bael Margriet J.,
Vantomme André,
Temst Kristiaan
Publication year - 2016
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201500433
Subject(s) - ferroelectricity , electric field , materials science , polarity (international relations) , polarization (electrochemistry) , oxide , polarity reversal , interface (matter) , chemical physics , condensed matter physics , polarization density , metal , optoelectronics , nanotechnology , magnetic field , dielectric , chemistry , electrical engineering , voltage , physics , composite material , magnetization , metallurgy , cell , engineering , biochemistry , quantum mechanics , capillary number , capillary action
The functionality and electronic properties of metal/ferroelectric systems rely heavily on the chemical and structural properties of the interface. The isotope sensitive technique of nuclear resonant scattering is used to selectively study the chemistry and magnetic state of the Fe/BaTiO 3 interface. An electric polarity‐dependent modification of the metal/ferroelectric oxide interface has been systematically observed. The results show that the interface can be oxidized or reduced by inverting the polarity of the electric field applied across the interface above a threshold field value of ±400 kV m −1 . Remarkably, the final interface state depends on the polarization history of the system. Based on these results, a model for the electric field induced ion transport at the Fe/BaTiO 3 interface has been suggested. Such subtle structural changes at the interface deteriorate the magnetoelectric coupling. However, for certain applications where an oxide layer is required at metal/ferroelectric oxide interfaces, the electric fields can be used to control interdiffusion processes.