Giant electrocaloric effect in asymmetric ferroelectric tunnel junctions at room temperature

Journal Article · Sun Feb 23 23:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4866272· OSTI ID:22293106

Liu, Yang; Infante, Ingrid C.; Dkhil, Brahim ^[1]; Lou, Xiaojie ^[2]

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1. Laboratoire Structures, Propriétés et Modélisation des Solides, UMR 8580 CNRS-Ecole Centrale Paris, Grande Voie des Vignes, Châtenay-Malabry Cedex 92295 (France)
2. Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, and State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 (China)

Room-temperature electrocaloric properties of Pt/BaTiO{sub 3}/SrRuO{sub 3} 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 ΔT for the two opposite polarization orientations. This difference under a typical writing voltage of 3 V can reach over 1 K as the barrier thickness decreases. Thanks to the ultrahigh external stimulus, a giant electrocaloric effect (1.53 K/V) with ΔT being over 4.5 K can be achieved at room temperature, which demonstrates the perspective of FTJs as a promising solid-state refrigeration.

• OSTI ID: 22293106
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
ELECTRIC POTENTIAL
FERROELECTRIC MATERIALS
PLATINUM COMPOUNDS
POLARIZATION
RUTHENIUM OXIDES
SUPERCONDUCTING JUNCTIONS
TEMPERATURE RANGE 0273-0400 K
THERMODYNAMIC MODEL
THERMOELECTRIC PROPERTIES
TITANATES
TUNNEL EFFECT