Suchergebnisse

The intrinsic mobile interfaces in ferroelectrics—the domain walls can drive and enhance diverse ferroelectric properties, essential for modern applications. Control over the motion of domain walls is of high practical importance. Here we analyse theoretically and show experimentally epitaxial ferroelectric films, where mobile domain walls coexist and interact with immobile growth-induced interfaces—columnar boundaries. Whereas these boundaries do not disturb the long-range crystal order, they affect the behaviour of domain walls in a peculiar selective manner. The columnar boundaries substantially modify the behaviour of non-ferroelastic domains walls, but have negligible impact on the ferroelastic ones. The results suggest that introduction of immobile boundaries into ferroelectric films is a viable method to modify domain structures and dynamic responses at nano-scale that may serve to functionalization of a broader range of ferroelectric films where columnar boundaries naturally appear as a result of the 3D growth. ; The authors are grateful to Prof. A. Gruverman for useful discussions. Marijke Spanjer is acknowledged for proofreading the manuscript. PY acknowledges the Russian Foundation for Basic Research, Grant No. 19-02-00938. The study of the interaction of ferroelastic DWs with CBs was carried out under a state contract with IT SB RAS. KS acknowledges the support by the French Government "Investments for the Future" Program, University of Bordeaux Initiative of Excellence (IDEX Bordeaux), and by the Generalitat de Catalunya (Grant No. 2017SGR 1506). PY, AD and MT acknowledge the Operational Program Research, Development and Education, financed by the European Structural and Investment Funds and the Czech Ministry of Education, Youth, and Sports (Project No. SOLID21, CZ.02.1.01/0.0/0.0/16_019/0000760). MT acknowledges support from the Czech Science Foundation (Grant No. 19-09671S). JP acknowledges the funding from the Academy of Finland (Grant No. 298409). ; Peer reviewed