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Controlled Sign Reversal of Electroresistance in Oxide Tunnel Junctions by Electrochemical-Ferroelectric Coupling.
Hernandez-Martin, D; Gallego, F; Tornos, J; Rouco, V; Beltran, J I; Munuera, C; Sanchez-Manzano, D; Cabero, M; Cuellar, F; Arias, D; Sanchez-Santolino, G; Mompean, F J; Garcia-Hernandez, M; Rivera-Calzada, A; Pennycook, S J; Varela, M; Muñoz, M C; Sefrioui, Z; Leon, C; Santamaria, J.
Afiliação
  • Hernandez-Martin D; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Gallego F; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Tornos J; 2D-Foundry Group, Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, 28049 Madrid, Spain.
  • Rouco V; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Beltran JI; 2D-Foundry Group, Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, 28049 Madrid, Spain.
  • Munuera C; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Sanchez-Manzano D; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Cabero M; Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Cuellar F; 2D-Foundry Group, Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, 28049 Madrid, Spain.
  • Arias D; Unidad Asociada UCM/CSIC, Laboratorio de Heteroestructuras con Aplicación en Spintrónica, 28049 Madrid, Spain.
  • Sanchez-Santolino G; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Mompean FJ; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Garcia-Hernandez M; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Rivera-Calzada A; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Pennycook SJ; GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Varela M; 2D-Foundry Group, Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, 28049 Madrid, Spain.
  • Muñoz MC; Instituto Pluridisciplinar, Universidad Complutense de Madrid, 28040 Madrid, Spain.
  • Sefrioui Z; 2D-Foundry Group, Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, 28049 Madrid, Spain.
  • Leon C; Unidad Asociada UCM/CSIC, Laboratorio de Heteroestructuras con Aplicación en Spintrónica, 28049 Madrid, Spain.
  • Santamaria J; 2D-Foundry Group, Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, 28049 Madrid, Spain.
Phys Rev Lett ; 125(26): 266802, 2020 Dec 31.
Article em En | MEDLINE | ID: mdl-33449729
The persistence of ferroelectricity in ultrathin layers relies critically on screening or compensation of polarization charges which otherwise destabilize the ferroelectric state. At surfaces, charged defects play a crucial role in the screening mechanism triggering novel mixed electrochemical-ferroelectric states. At interfaces, however, the coupling between ferroelectric and electrochemical states has remained unexplored. Here, we make use of the dynamic formation of the oxygen vacancy profile in the nanometer-thick barrier of a ferroelectric tunnel junction to demonstrate the interplay between electrochemical and ferroelectric degrees of freedom at an oxide interface. We fabricate ferroelectric tunnel junctions with a La_{0.7}Sr_{0.3}MnO_{3} bottom electrode and BaTiO_{3} ferroelectric barrier. We use poling strategies to promote the generation and transport of oxygen vacancies at the metallic top electrode. Generated oxygen vacancies control the stability of the ferroelectric polarization and modify its coercive fields. The ferroelectric polarization, in turn, controls the ionization of oxygen vacancies well above the limits of thermodynamic equilibrium, triggering the build up of a Schottky barrier at the interface which can be turned on and off with ferroelectric switching. This interplay between electronic and electrochemical degrees of freedom yields very large values of the electroresistance (more than 10^{6}% at low temperatures) and enables a controlled switching between clockwise and counterclockwise switching modes in the same junction (and consequently, a change of the sign of the electroresistance). The strong coupling found between electrochemical and electronic degrees of freedom sheds light on the growing debate between resistive and ferroelectric switching in ferroelectric tunnel junctions, and moreover, can be the source of novel concepts in memory devices and neuromorphic computing.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Espanha

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Espanha