Polarization structure of nanostrip domain intersections in GeTe films
Abstract
Ferroelectric germanium telluride is under active consideration for spintronic and thermoelectric applications. The control of the ferroelectric domain walls is a key issue to optimize the electronic and thermal properties of GeTe thin films. Domain walls properties are usually driven by the mechanical and electrostatic compatibility conditions of twin domains. However, in dense ferroelectric domain structures these compatibility conditions are hardly fulfilled everywhere. In particular intersection of domains may result in complex lattice relaxations and polarization textures. In this study, we have fabricated GeTe thin films on silicon substrate and elucidated the intersections of a-type domains using 3D reciprocal space maps, scanning tunneling microscopy, and second-harmonic microscopy. We demonstrate the presence of complex structural reorganizations that manifest by the formation of charged domain walls, large lattice rotations, and enhanced stretching of the rhombohedral lattice.
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