2 research outputs found
Single-Crystalline SrRuO<sub>3</sub> Nanomembranes: A Platform for Flexible Oxide Electronics
The
field of oxide electronics has benefited from the wide spectrum of
functionalities available to the ABO<sub>3</sub> perovskites, and
researchers are now employing defect engineering in single crystalline
heterostructures to tailor properties. However, bulk oxide single
crystals are not conducive to many types of applications, particularly
those requiring mechanical flexibility. Here, we demonstrate the realization
of an all-oxide, single-crystalline nanomembrane heterostructure.
With a surface-to-volume ratio of 2 × 10<sup>7</sup>, the nanomembranes
are fully flexible and can be readily transferred to other materials
for handling purposes or for new materials integration schemes. Using <i>in situ</i> synchrotron X-ray scattering, we find that the nanomembranes
can bond to other host substrates near room temperature and demonstrate
coupling between surface reactivity and electromechanical properties
in ferroelectric nanomembrane systems. The synthesis technique described
here represents a significant advancement in materials integration
and provides a new platform for the development of flexible oxide
electronics
Interlayer Coupling Controlled Ordering and Phases in Polar Vortex Superlattices
The
recent discovery of polar topological structures
has opened
the door for exciting physics and emergent properties. There is, however,
little methodology to engineer stability and ordering in these systems,
properties of interest for engineering emergent functionalities. Notably,
when the surface area is extended to arbitrary thicknesses, the topological
polar texture becomes unstable. Here we show that this instability
of the phase is due to electrical coupling between successive layers.
We demonstrate that this electrical coupling is indicative of an effective
screening length in the dielectric, similar to the conductor–ferroelectric
interface. Controlling the electrostatics of the superlattice interfaces,
the system can be tuned between a pure topological vortex state and
a mixed classical-topological phase. This coupling also enables engineering
coherency among the vortices, not only tuning the bulk phase diagram
but also enabling the emergence of a 3D lattice of polar textures