Nanoscale ferroelectric tunnel junctions based on ultrathin BaTiO3film and Ag nanoelectrodes

X. S. Gao, J. M. Liu, K. Au, Jiyan Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

42 Citations (Scopus)

Abstract

In this work, Ag nanoisland electrodes (nanoelectrodes) have been deposited on top of ultrathin ferroelectric BaTiO3(BTO) films to form a nanoscale metal-ferroelectric-metal tunnel junction by integrating growth techniques of nanocluster beam source and laser-molecular beam epitaxy. The ultrathin BTO films (∼3 nm thick) exhibit both apparent ferroelectric polarization reversal and ferroelectric tunneling related resistive switching behaviors. The introducing of Ag nanoislands (∼20 nm in diameter) as top electrode substantially enhances the tunneling current and alters the symmetry of I-V hysteresis curves. The enhanced tunneling current is likely due to the reduction in tunneling barrier height and an increase in effective tunneling area by Ag nano-electrodes, while the improved symmetric in I-V curve may be attributed to the variation of electrode-oxide contact geometry.
Original languageEnglish
Article number142905
JournalApplied Physics Letters
Volume101
Issue number14
DOIs
Publication statusPublished - 1 Oct 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this