journal article·2023-09-12

Robust Switchable Polarization and Coupled Electronic Characteristics of Magnesium-Doped Zinc Oxide

Haoze Zhang, Ayana Alanthattil, Richard F. Webster, Dawei Zhang, Mohammad B. Ghasemian, Rajendra B. Venkataramana, Jan Seidel, Pankaj Sharma

ACS Nano· Volume 17· Issue 17
Publisher page

Abstract

Ferroelectrics possess a spontaneous polarization that is switchable by an electric field and is critical for the development of low-energy nanoelectronics and neuromorphic applications. However, apart from a few recent developments, the realization of switchable polarization in metal oxides with simpler structures has been a major challenge. Here, we demonstrate the presence of robust switchable polarization at the level of a single nanocrystallite in magnesium-doped zinc oxide thin films with polar wurtzite crystal structures. Using a combination of high-resolution scanning probe microscopy and spectroscopic techniques, voltage control of the polarization and the coupled electronic transport behavior revealing a giant resistance change of approximately 10000% is unveiled. Time- and frequency-resolved nanoscale measurements provide key insights into the polarization phenomenon and a 9-fold increase in the effective longitudinal piezoelectric coefficient. Our work thus constitutes a crucial step toward validating nanoscale ferroelectricity in polar wurtzites for use in advanced nanoelectronics and memory applications.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Ferroelectric and Piezoelectric Materials · Ferroelectric and Negative Capacitance Devices · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, The University of New South Wales (UNSW) Sydney, Sydney, New South Wales 2052, Australia

Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, India

Electron Microscope Unit, UNSW Sydney, Sydney, New South Wales 2052, Australia

ARC Centre of Excellence in Future Low-Energy Electronics Technologies, UNSW Sydney, Sydney, New South Wales 2052, Australia

School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, New South Wales 2006, Australia

School of Chemical Engineering, UNSW Sydney, Sydney, New South Wales 2052, Australia

College of Science and Engineering, Flinders University, Bedford Park, South Australia 5042, Australia

Flinders Institute for Nanoscale Science and Technology, Flinders University, Adelaide, South Australia 5042, Australia

Funding

Flinders University · Centre of Excellence in Future Low-Energy Electronics Technologies, Australian Research Council · Manipal Academy of Higher Education · University of New South Wales

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