Reference : Control of surface potential at polar domain walls in a nonpolar oxide
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Control of surface potential at polar domain walls in a nonpolar oxide
Nataf, G. F. [> >]
Guennou, Mael mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Kreisel, Jens mailto [University of Luxembourg > Rectorate >]
Hicher, P. [> >]
R., Haumont [> >]
Aktas, O. [> >]
Salje, E. K. H. [> >]
Tortech, L. [> >]
Mathieu, C. [> >]
Martinotti, D. [> >]
Barrett, N. [> >]
Physical Review Materials
2475-9953 Nataf, Guillaume F./J-2175-2019 Aktas, Oktay/F-7419-2016 Nataf, Guillaume F./0000-0001-9215-4717 Aktas, Oktay/0000-0001-6164-9477 ISI:000418775000003
[en] Ferroic domain walls could play an important role in microelectronics given their nanometric size and often distinct functional properties. Until now, devices and device concepts were mostly based on mobile domain walls in ferromagnetic and ferroelectric materials. A less explored path is to make use of polar domain walls in nonpolar ferroelastic materials. Indeed, while the polar character of ferroelastic domain walls has been demonstrated, polarization control has been elusive. Here, we report evidence for the electrostatic signature of the domain-wall polarization in nonpolar calcium titanate (CaTiO3). Macroscopic mechanical resonances excited by an ac electric field are observed as a signature of a piezoelectric response caused by polar walls. On the microscopic scale, the polarization in domain walls modifies the local surface potential of the sample. Through imaging of surface potential variations, we show that the potential at the domain wall can be controlled by electron injection. This could enable devices based on nondestructive information readout of surface potential.

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