Influence of the polarization anisotropy on the electrocaloric effect in epitaxial PMN-PT thin films

Mietschke M, Chekhonin P, Molin C, Gebhardt S, Faehler S, Nielsch K, Schultz L, Huehne R (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Journal of Applied Physics AIP Publishing

Book Volume: 120

Article Number: 114102

Journal Issue: 11

DOI: 10.1063/1.4962858

Abstract

Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) compounds, which are typically used for high performance actuator applications due to their outstanding piezoelectric properties, show, in addition, a pronounced electrocaloric (EC) effect. The study of epitaxial films is a useful tool to analyze the correlation between the microstructure and EC properties in order to optimize the performance of these materials. Therefore, the 0.9PMN-0.1PT films were grown by a pulsed laser deposition on (001) as well as (111) oriented SrTiO3 single crystalline substrates using a La0.7Sr0.3CoO3 buffer as the bottom electrode and additional Au top electrodes. The structural properties determined by a high resolution X-ray and electron microscopy techniques indicated an undisturbed epitaxial growth. The anisotropy of the ferroelectric domain structure was investigated by a vertical and lateral piezoresponse force microscopy showing clear differences between the two orientations. A significant reduction of the thermal hysteresis was observed in the T-dependent polarization measurements for (111) oriented PMN-PT films, whereas the indirectly determined EC properties yield a maximum ΔT of around 15 K at 40 °C for a field of about 400 kV/cm for both film orientations.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Fraunhofer-Institut für Keramische Technologien und Systeme (IKTS) DE Germany (DE)

How to cite

APA:

Mietschke, M., Chekhonin, P., Molin, C., Gebhardt, S., Faehler, S., Nielsch, K.,... Huehne, R. (2016). Influence of the polarization anisotropy on the electrocaloric effect in epitaxial PMN-PT thin films. Journal of Applied Physics, 120(11). https://dx.doi.org/10.1063/1.4962858

MLA:

Mietschke, M., et al. "Influence of the polarization anisotropy on the electrocaloric effect in epitaxial PMN-PT thin films." Journal of Applied Physics 120.11 (2016).

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