Colossal and tunable dielectric tunability in domain-engineered barium strontium titanate

Dongfang Chen, Sergey Nisnevich, Liyan Wu, Zongquan Gu, John Carroll, Yizhe Jiang, Cedric J. G. Meyers, Kathleen Coleman, Brendan M. Hanrahan, Lane W. Martin, Ilya Grinberg and Jonathan E. Spanier ()
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Dongfang Chen: Drexel University
Sergey Nisnevich: Drexel University
Liyan Wu: Drexel University
Zongquan Gu: Drexel University
John Carroll: Drexel University
Yizhe Jiang: University of California at Berkeley
Cedric J. G. Meyers: Drexel University
Kathleen Coleman: U.S. Army Research Laboratory
Brendan M. Hanrahan: U.S. Army Research Laboratory
Lane W. Martin: Rice University
Ilya Grinberg: Bar Ilan University
Jonathan E. Spanier: Drexel University

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Realization of tunable materials that are multifunctional and maintain high performance in dynamically changing environments is a fundamental goal of science and engineering. Tunable dielectrics form the basis of a wide variety of communication and sensing devices and require breakthrough performance improvement to enable next-generation technologies. Using phenomenological modeling, film growth, and characterization, we show that devices consisting of domain-wall-rich Ba0.8Sr0.2TiO3 films close to a polar-domain-variant phase boundary exhibit colossal dielectric tunability of 100:1 (99%) at a voltage (electric field) of ~15 V (750 kV/cm), resulting in a tunability-quality factor product figure of merit that rises to nearly 105, two orders of magnitude higher than the best previous reported values. Remarkably, varying the amplitude of alternating-current bias enables modulation of this tunability by 50%, owing to domain-wall motion. These results suggest that domain engineering is a powerful approach for achieving excellent modulation of functional properties in ferroelectric films.

Date: 2025
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DOI: 10.1038/s41467-025-63449-4

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