Universität zu Köln

Bak, Ohheum, Holstad, Theodor S., Tan, Yueze, Lu, Haidong, Evans, Donald M. ORCID: 0000-0002-8546-0676, Hunnestad, Kasper A., Wang, Bo, McConville, James P., V, Becker, Petra, Bohat, Ladislav, Lukyanchuk, Igor, Vinokur, Valerii M., van Helvoort, Antonius T. J., Gregg, J. Marty, Chen, Long-Qing ORCID: 0000-0003-3359-3781, Meier, Dennis and Gruverman, Alexei (2020). Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate. Adv. Funct. Mater., 30 (21). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1616-3028

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Abstract

Application of scanning probe microscopy techniques such as piezoresponse force microscopy (PFM) opens the possibility to re-visit the ferroelectrics previously studied by the macroscopic electrical testing methods and establish a link between their local nanoscale characteristics and integral response. It is reported that the nanoscale PFM studies and phase-field modeling of the static and dynamic behavior of the domain structure in the well-known ferroelectric material lead germanate Pb5Ge3O11. Several unusual phenomena are revealed: 1) domain formation during the paraelectric-to-ferroelectric phase transition, which exhibits an atypical cooling rate dependence; 2) unexpected electrically induced formation of the oblate domains due to the preferential domain walls motion in the directions perpendicular to the polar axis, contrary to the typical domain growth behavior observed so far; 3) absence of the bound charges at the 180 degrees head-to-head (H-H) and tail-totail (T-T) domain walls, which typically exhibit a significant charge density in other ferroelectrics due to the polarization discontinuity. This strikingly different behavior is rationalized by the phase field modeling of the dynamics of uncharged H-H and T-T domain walls. The results provide a new insight into the emergent physics of the ferroelectric domain boundaries, revealing unusual properties not exhibited by conventional Ising-type walls.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bak, Ohheum UNSPECIFIED UNSPECIFIED UNSPECIFIED Holstad, Theodor S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tan, Yueze UNSPECIFIED UNSPECIFIED UNSPECIFIED Lu, Haidong UNSPECIFIED UNSPECIFIED UNSPECIFIED Evans, Donald M. UNSPECIFIED orcid.org/0000-0002-8546-0676 UNSPECIFIED Hunnestad, Kasper A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Bo UNSPECIFIED UNSPECIFIED UNSPECIFIED McConville, James P., V UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, Petra UNSPECIFIED UNSPECIFIED UNSPECIFIED Bohat, Ladislav UNSPECIFIED UNSPECIFIED UNSPECIFIED Lukyanchuk, Igor UNSPECIFIED UNSPECIFIED UNSPECIFIED Vinokur, Valerii M. UNSPECIFIED UNSPECIFIED UNSPECIFIED van Helvoort, Antonius T. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gregg, J. Marty UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, Long-Qing UNSPECIFIED orcid.org/0000-0003-3359-3781 UNSPECIFIED Meier, Dennis UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruverman, Alexei UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-340654
DOI:	10.1002/adfm.202000284
Journal or Publication Title:	Adv. Funct. Mater.
Volume:	30
Number:	21
Date:	2020
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1616-3028
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language KINETICS; CRYSTAL; GROWTH; MODEL Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/34065