Piezoelectrics are a category of useful supplies which have been extensively used for utility in trendy electro-mechanical and mechatronics applied sciences. *
The signal of longitudinal piezoelectric coefficients is usually optimistic however just lately just a few ferroelectrics, reminiscent of ferroelectric polymer poly(vinylidene fluoride) and van der Waals ferroelectric CuInP2S6, have been experimentally discovered to have detrimental piezoelectricity.
Within the article “Tunable and parabolic piezoelectricity in hafnia below epitaxial pressure” Hao Cheng, Peijie Jiao, Jian Wang, Mingkai Qing, Yu Deng, Jun-Ming Liu, Laurent Bellaiche, Di Wu and Yurong Yang, utilizing first-principles calculation and measurements, present that the signal of the longitudinal linear piezoelectric coefficient of HfO2 may be tuned from optimistic to detrimental through epitaxial pressure. *
Nonlinear and even parabolic piezoelectric behaviors are additional discovered at tensile epitaxial pressure. *
This parabolic piezoelectric conduct implies that the polarization decreases when rising the magnitude of both compressive or tensile longitudinal pressure, or, equivalently, that the pressure will increase when rising the magnitude of electrical discipline being both parallel or antiparallel to the course of polarization. The bizarre piezoelectric results are from the chemical coordination of the energetic oxygen atoms. *
These putting piezoelectric options of optimistic and detrimental signal, in addition to linear and parabolical behaviors, increase the present information in piezoelectricity and broaden the potential of piezoelectric functions in direction of electro-mechanical and communications expertise. *
NanoWorld Pt/Ir coated Pointprobe® EFM AFM probes have been used for the pattern characterization by switching spectroscopy PFM measurements.
Switching spectroscopy PFM measurements have been carried out on the naked HZO movie floor at room temperature with Nanoworld Pointprobe® EFM in a commercially out there atomic drive microscope, whereas the LSMO electrode was grounded.
a XRD θ-2θ patterns of HZO movies deposited on (110)-oriented LAO with 20-, 33-, 66-nm-thick LSMO buffer layers. b PFM section loops of the HZO movies deposited on 20-, 33- and 66-nm-thick LSMO buffered LAO substrates. c–e Reciprocal area mappings across the (310) spot of HZO/LSMO/LAO with c 20-, d 33-, and e 66-nm-thick LSMO buffer layers.
*Hao Cheng, Peijie Jiao, Jian Wang, Mingkai Qing, Yu Deng, Jun-Ming Liu, Laurent Bellaiche, Di Wu and Yurong Yang
Tunable and parabolic piezoelectricity in hafnia below epitaxial pressure
Nature Communications quantity 15, Article quantity: 394 (2024)
DOI: https://doi.org/10.1038/s41467-023-44207-w
Open Entry The article “ Tunable and parabolic piezoelectricity in hafnia below epitaxial pressure ” by Hao Cheng, Peijie Jiao, Jian Wang, Mingkai Qing, Yu Deng, Jun-Ming Liu, Laurent Bellaiche, Di Wu and Yurong Yang is licensed below a Artistic Commons Attribution 4.0 Worldwide License, which allows use, sharing, adaptation, distribution and replica in any medium or format, so long as you give applicable credit score to the unique creator(s) and the supply, present a hyperlink to the Artistic Commons license, and point out if modifications have been made. The pictures or different third celebration materials on this article are included within the article’s Artistic Commons license, except indicated in any other case in a credit score line to the fabric. If materials is just not included within the article’s Artistic Commons license and your supposed use is just not permitted by statutory regulation or exceeds the permitted use, you’ll need to acquire permission straight from the copyright holder. To view a duplicate of this license, go to http://creativecommons.org/licenses/by/4.0/.
