Giant electrocaloric effect in asymmetric ferroelectric tunnel junctions at room temperature - Archive ouverte HAL
Journal Articles Applied Physics Letters Year : 2014

Giant electrocaloric effect in asymmetric ferroelectric tunnel junctions at room temperature

Abstract

Room-temperature electrocaloric properties of Pt/BaTiO3/SrRuO3 ferroelectric tunnel junctions (FTJs) are studied by using a multiscale thermodynamic model. It is found that there is a divergence in the adiabatic temperature change DT for the two opposite polarization orientations. This difference under a typical writing voltage of 3V can reach over 1K as the barrier thickness decreases. Thanks to the ultrahigh external stimulus, a giant electrocaloric effect (1.53 K/V) with DT being over 4.5K can be achieved at room temperature, which demonstrates the perspective of FTJs as a promising solid-state refrigeration.
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Dates and versions

hal-01053232 , version 1 (30-07-2014)

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Yehan Liu, I.C. Infante, X. Lou, B. Dkhil. Giant electrocaloric effect in asymmetric ferroelectric tunnel junctions at room temperature. Applied Physics Letters, 2014, 104, pp.082901. ⟨10.1063/1.4866272⟩. ⟨hal-01053232⟩
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