Scaling of structure and electrical properties in ultrathin epitaxial ferroelectric heterostructures

[en] Scaling of the structural order parameter, polarization, and electrical properties was investigated in model ultrathin epitaxial SrRuO3/PbZr0.2Ti0.8O3/SrRuO3/SrTiO3 heterostructures. High-resolution transmission electron microscopy images revealed the interfaces to be sharp and fully coherent. Synchrotron x-ray studies show that a high tetragonality (c/a similar to 1.058) is maintained down to 50 angstrom thick films, suggesting indirectly that ferroelectricity is fully preserved at such small thicknesses. However, measurement of the switchable polarization (Delta P) using a pulsed probe setup and the out-of-plane piezoelectric response (d(33)) revealed a systematic drop from similar to 140 mu C/cm(2) and 60 pm/V for a 150 angstrom thick film to 11 mu C/cm(2) and 7 pm/V for a 50 angstrom thick film. This apparent contradiction between the structural measurements and the measured switchable polarization is explained by an increasing presence of a strong depolarization field, which creates a pinned 180 degrees polydomain state for the thinnest films. Existence of a polydomain state is demonstrated by piezoresponse force microscopy images of the ultrathin films. These results suggest that the limit for a ferroelectric memory device may be much larger than the fundamental limit for ferroelectricity. (c) 2006 American Institute of Physics.

Disciplines :

Physics

Author, co-author :

Nagarajan, V.

Junquera, J.

He, J. Q.

Jia, C. L.

Waser, R.

Lee, K.

Kim, Y. K.

Baik, S.

Zhao, T.

Ramesh, R.

Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Rabe, K. M.

Language :

English

Title :

Scaling of structure and electrical properties in ultrathin epitaxial ferroelectric heterostructures

Publication date :

01 September 2006

Journal title :

Journal of Applied Physics

ISSN :

0021-8979

eISSN :

1089-7550

Publisher :

Amer Inst Physics, Melville, United States - New York

Volume :

100

Pages :

051609

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 02 December 2009

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113

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