A grease for domain walls motion in HfO.sub.2./sub.-based ferroelectrics

0556006 - FZÚ 2023 RIV GB eng J - Journal Article
Kashir, Alireza - Farahani, M.G. - Lančok, Ján - Hwang, H. - Kamba, Stanislav
A grease for domain walls motion in HfO₂-based ferroelectrics.
Nanotechnology. Roč. 33, č. 15 (2022), č. článku 155703. ISSN 0957-4484. E-ISSN 1361-6528
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA21-06802S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : ferroelectric * memory * coercive field * permittivity
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.5, year: 2022
Method of publishing: Open access with time embargo
https://doi.org/10.1088/1361-6528/ac4679

A new design to reduce coercive field Ec by fabricating nanolaminate Hf0.5Zr0.5O2/ZrO2 thin films is used, followed by a ensuing annealing process at 700 C. High-resolution TEM imaging detects tetragonal-like domain walls between orthorhombic polar regions. These walls decrease the potential barrier of polarization reversal in HfO2 based films compared with to the conventional domain walls with a single non-polar spacer, causing about a 40% decrease in Ec. Permittivity exhibits substantial increase near the Ec compared to the conventional Hf0.5Zr0.5O2 films justifying the higher mobility of domain walls. The tetragonal-like regions served as grease easing the movement of the domain wall and reducing Ec.
Permanent Link: http://hdl.handle.net/11104/0330373