Determination of the electrostatic potential distribution in Pt/Fe:SrTiO(3)/Nb:SrTiO(3) thin-film structures by electron holography

We determined the electrostatic potential distribution in pristine Pt/Fe:SrTiO(3)/Nb:SrTiO(3) structures by electron holography experiments, revealing the existence of a depletion layer extending into the Nb-doped bottom electrode. Simulations of potential profiles in metal-insulator-metal structure...

Descripción completa

Detalles Bibliográficos
Autores principales: Marchewka, Astrid, Cooper, David, Lenser, Christian, Menzel, Stephan, Du, Hongchu, Dittmann, Regina, Dunin-Borkowski, Rafal E., Waser, Rainer
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4225551/
https://www.ncbi.nlm.nih.gov/pubmed/25381733
http://dx.doi.org/10.1038/srep06975
Descripción
Sumario:We determined the electrostatic potential distribution in pristine Pt/Fe:SrTiO(3)/Nb:SrTiO(3) structures by electron holography experiments, revealing the existence of a depletion layer extending into the Nb-doped bottom electrode. Simulations of potential profiles in metal-insulator-metal structures were conducted assuming different types and distributions of dopants. It is found that the presence of acceptor-type dopant concentrations at the Fe:SrTiO(3)/Nb:SrTiO(3) interface with a donor-doped insulating layer provides a good match to the measured profile. Such acceptor-type interface concentrations may be associated with Sr vacancies on the Nb:SrTiO(3) side of the bottom interface.

Ejemplares similares