Thomas-Fermi interfacial screening with voltage-dependence of the screening lengths and influence of oxygen vacancies in MFTJs

Deepali Jagga, Artur Useinov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Magnetic tunnel junctions with ferroelectric (FE) barrier (MFTJs) are simulated within modified transport model and compared with experimental samples. As a novelty, linearized approach of Thomas Fermi screening is utilized for a simulation of the tunneling behavior through the magnetic metal/dielectric, magnetic metal/ferroelectric (MM/DE, MM/FE) and non-magnetic metal/ferroelectric (NM/FE) interfaces, where the screening length for each interface changes with applied voltage, accounting the growing penetration of the electric field into the metal. In this work, current density (J) and tunnel electroresistance (TER) vs the applied voltage (V) are compared for NM/FE(3nm)/MM and NM/DE/ FE(5nm)/DE/MM junctions. In addition, the impact of oxygen vacancies located on the interfaces is incorporated in the model for NM/DE/FE(5nm)/DE/MM system. As a result, theoretical model modification allows to reproduce experimental data with a better precision than previous approach with a constant screening lengths.

Original languageEnglish
Title of host publication2023 International VLSI Symposium on Technology, Systems and Applications, VLSI-TSA/VLSI-DAT 2023 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9798350334166
DOIs
StatePublished - 2023
Event2023 International VLSI Symposium on Technology, Systems and Applications, VLSI-TSA/VLSI-DAT 2023 - Hsinchu, Taiwan
Duration: 17 Apr 202320 Apr 2023

Publication series

Name2023 International VLSI Symposium on Technology, Systems and Applications, VLSI-TSA/VLSI-DAT 2023 - Proceedings

Conference

Conference2023 International VLSI Symposium on Technology, Systems and Applications, VLSI-TSA/VLSI-DAT 2023
Country/TerritoryTaiwan
CityHsinchu
Period17/04/2320/04/23

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