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Reversible Control of Crystalline Rotors by Squeezing Their Hydrogen Bond Cloud Across a Halogen Bond-Mediated Phase Transition

Reversible Control of Crystalline Rotors by Squeezing Their Hydrogen Bond Cloud Across a Halogen Bond-Mediated Phase Transition

Cyprien Lemouchi, Hiroshi M. Yamamoto, Reizo Kato, Sergey Simonov, Leokadiya Zorina,Antonio Rodríguez-Fortea, Enric Canadell, Pawel Wzietek, Konstantinos Iliopoulos, Denis Gindre, Michael Chrysos, and Patrick Batail*.      Cryst. Growth Des., 2014, 14 (7), pp 3375–3383

Selectable Spontaneous Polarization Direction and Magnetic Anisotropy in BiFeO3−CoFe2O4 Epitaxial Nanostructures

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13092010

N. Dix* R. Muralidharan, J-M Rebled, S. Estradé, F. Peiró, M. Varela, J. Fontcuberta and F. Sánchez*
ACS Nano
, 2010, 4 (8), pp 4955–4961
DOI: 10.1021/nn101546r

We demonstrate that epitaxial strain engineering is an efficient method to manipulate the ferromagnetic and ferroelectric properties in BiFeO3−CoFe2O4 columnar nanocomposites. On one hand, the magnetic anisotropy of CoFe2O4 is totally tunable from parallel to perpendicular controlling the CoFe2O4 strain with proper combinations of substrate and ferroelectric phase. On the other hand, the selection of the used substrate allows the growth of the rhombohedral bulk phase of BiFeO3 or the metastable nearly tetragonal one, which implies a rotation of the ferroelectric polar axis from [111] to close to the [001] direction. Remarkably, epitaxy is preserved and interfaces are semicoherent even when lattice mismatch is above 10%. The broad range of sustainable mismatch suggests new opportunities to assemble epitaxial nanostructures combining highly dissimilar materials with distinct functionalities.

 

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