Nonlinear electric field dependence of electrocaloric effect in (001)-epitaxial (Ba, Sr) TiO3 thin films

2017 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF)/International Workshop on Acoustic Transduction Materials and Devices (IWATMD)/Piezoresponse Force Microscopy (PFM) Pub Date : 2017-05-07 DOI:10.1109/ISAF.2017.8000214

S. Matsuo, T. Yamada, M. Yoshino, T. Nagasaki, T. Kamo, H. Funakubo

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Abstract

Recently, electrocaloric (EC) effect in ferroelectric thin films has been intensively studied for emerging cooling devices. The pyroelectric coefficient, which mainly determines the magnitude of the EC effect, depends not only on the temperature but also on the applied electric field. Therefore, we investigated the influence of the electric field on the EC effect in a Ba0.5Sr0.5TiO3 thin film fabricated on SrRuO3/SrTiO3 (001) substrate. It was found that the temperature showing the largest EC effect, Tmax, increased with the electric field change ΔE when ΔE was below 115 kV/cm. However, it decreased with further ΔE. The observed tendency was different from the theoretical prediction.

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(001)-外延(Ba, Sr) TiO3薄膜中电热效应的非线性电场依赖性

近年来，铁电薄膜中的电热效应在新型冷却装置中得到了广泛的研究。热释电系数不仅与温度有关，而且与外加电场有关，它主要决定了电火花效应的大小。因此，我们研究了电场对在SrRuO3/SrTiO3(001)衬底上制备的Ba0.5Sr0.5TiO3薄膜的EC效应的影响。结果表明，当ΔE < 115 kV/cm时，EC效应最大的温度Tmax随电场变化而增大ΔE。然而，随着ΔE的进一步下降。观测到的趋势与理论预测不同。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2017 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF)/International Workshop on Acoustic Transduction Materials and Devices (IWATMD)/Piezoresponse Force Microscopy (PFM)

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