![]() ![]() Among these oxide materials, the perovskite SrTiO 3 has stimulated considerable interest as it hosts a rich spectrum of physical properties such as dilute superconductivity 1, multiple structural instabilities 2, and a variety of emergent phenomena arising from the interface of SrTiO 3-based heterostructures 3, 4, 5, 6, 7. Transition metal oxides exhibit a diverse set of electrical, magnetic, and thermal properties and hold great promise for modern technological applications. Our work reveals the enormous potential of employing oxide membranes to create and enhance ferroelectricity in environmentally benign lead-free oxides, which hold great promise for applications ranging from non-volatile memories and microwave electronics. Using a combination of scanning probe microscopy, optical second harmonic generation measurements, and atomistic modeling, we demonstrate robust room-temperature ferroelectricity in SrTiO 3 with 2.0% uniaxial tensile strain, corroborated by the notable features of 180° ferroelectric domains and an extrapolated transition temperature of 400 K. Here, we observe and explore dynamic strain-induced ferroelectricity in SrTiO 3 by laminating freestanding oxide films onto a stretchable polymer substrate. This approach, however, lacks the ability to produce large and continuously variable strain states, thus limiting the potential for designing and tuning the desired properties of ferroelectric films. Advances in complex oxide heteroepitaxy have highlighted the enormous potential of utilizing strain engineering via lattice mismatch to control ferroelectricity in thin-film heterostructures. ![]()
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