English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/121325
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Título

Nanomechanics of flexoelectric switching

AutorOčenášek, J.; Lu, H.; Bark, C. W.; Eom, C. B.; Alcalá, J.; Catalán, Gustau ; Gruverman, Alexei
Fecha de publicación14-jul-2015
EditorAmerican Physical Society
CitaciónPhysical Review - Section B - Condensed Matter 92(3): 035417 (2015)
ResumenWe examine the phenomenon of flexoelectric switching of polarization in ultrathin films of barium titanate induced by a tip of an atomic force microscope (AFM). The spatial distribution of the tip-induced flexoelectricity is computationally modeled both for perpendicular mechanical load (point measurements) and for sliding load (scanning measurements), and compared with experiments. We find that (i) perpendicular load does not lead to stable ferroelectric switching in contrast to the load applied in the sliding contact load regime, due to nontrivial differences between the strain distributions in both regimes: ferroelectric switching for the perpendicular load mode is impaired by a strain gradient inversion layer immediately underneath the AFM tip; while for the sliding load regime, domain inversion is unimpaired within a greater material volume subjected to larger values of the mechanically induced electric field that includes the region behind the sliding tip; (ii) beyond a relatively small value of an applied force, increasing mechanical pressure does not increase the flexoelectric field inside the film, but results instead in a growing volume of the region subjected to such field that aids domain nucleation processes; and (iii) the flexoelectric coefficients of the films are of the order of few nC/m, which is much smaller than for bulk BaTiO3 ceramics, indicating that there is a “flexoelectric size effect” that mirrors the ferroelectric one.
DescripciónOčenášek, J. et. al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.92.035417
URIhttp://hdl.handle.net/10261/121325
DOI10.1103/PhysRevB.92.035417
ISSN1098-0121
E-ISSN1550-235X
Aparece en las colecciones: (CIN2) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Nanomechanics_flexoelectric_switching_Ocenasek.pdf2,12 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.