Strain-Engineered Ferroelastic Structures in PbTiO3 Films and Their Control by Electric Fields
Langenberg, Eric (Cornell University)
Paik, Hanjong (Cornell University)
Smith, Eva H. (Cornell University)
Nair, Hari P. (Cornell University)
Hanke, Isabelle (Leibniz-Institut für Kristallzüchtung)
Ganschow, Steffen (Leibniz-Institut für Kristallzüchtung)
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia)
Schlom, Darrell G. (Kavli Institute at Cornell for Nanoscale Science)

Data:	2020
Resum:	We study the interplay between epitaxial strain, film thickness, and electric field in the creation, modification, and design of distinct ferroelastic structures in PbTiO thin films. Strain and thickness greatly affect the structures formed, providing a two-variable parameterization of the resulting self-assembly. Under applied electric fields, these strain-engineered ferroelastic structures are highly malleable, especially when a/c and a/a superdomains coexist. To reconfigure the ferroelastic structures and achieve self-assembled nanoscale-ordered morphologies, pure ferroelectric switching of individual c-domains within the a/c superdomains is essential. The stability, however, of the electrically written ferroelastic structures is in most cases ephemeral; the speed of the relaxation process depends sensitively on strain and thickness. Only under low tensile strain - as is the case for PbTiO on GdScO - and below a critical thickness do the electrically created a/c superdomain structures become stable for days or longer, making them relevant for reconfigurable nanoscale electronics or nonvolatile electromechanical applications.
Ajuts:	European Commission 708129
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Publicat a:	ACS applied materials & interfaces, Vol. 12, Issue 18 (May 2020) , p. 20691-20703, ISSN 1944-8252

DOI: 10.1021/acsami.0c04381

Preprint 35 p, 32.3 MB

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