AI Article Synopsis

  • Research on controlling ferroelectric domain walls at the nanoscale reveals new interfacial properties and functions, particularly focusing on charged domain walls (CDWs), which are crucial for next-gen nanoelectronics.
  • The study demonstrates the existence of CDWs in a lead-free (K,Na)NbO polycrystalline system using advanced microscopy techniques, showcasing their role in generating internal strain gradients within domains.
  • The interaction between light polarization and ferroelectric polarization affects domain switching, suggesting potential applications for remote light control in developing domain wall nanoelectronics.

Article Abstract

The control of ferroelectric domain walls at the nanometric level leads to novel interfacial properties and functionalities. In particular, the comprehension of charged domain walls, CDWs, lies at the frontier of future nanoelectronic research. Whereas many of the effects have been demonstrated for ideal archetypes, such as single crystals, and/or thin films, a similar control of CDWs on polycrystalline ferroelectrics has not been achieved. Here, we unambiguously show the presence of charged domain walls on a lead-free (K,Na)NbO polycrystalline system. The appearance of CDWs is observed in situ by confocal Raman microscopy and second harmonic generation microscopy. CDWs produce an internal strain gradient within each domain. Specifically, the anisotropic strain develops a crucial piece in the ferroelectric domain switching due to the coupling between the polarization of light and the ferroelectric polarization of the nanodomain in the (K,Na)NbO ceramic. This effect leads to the tuning of the ferroelectric domain switching by means of the light polarization angle. Our results will help to understand the relevance of charged domain walls on the ferroelectric domain switching process and may facilitate the development of domain wall nanoelectronics by remote light control utilizing polycrystalline ferroelectrics.

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http://dx.doi.org/10.1039/c7nr04304jDOI Listing

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