Tag Archives: PointProbe® Plus (PPP)

Room Temperature Polarization Phenomena in Nanocrystalline and Epitaxial Thin Films of Gd-Doped Ceria Studied by Kelvin Probe Force Microscopy

In their study “Room Temperature Polarization Phenomena in Nanocrystalline and Epitaxial Thin Films of Gd-Doped Ceria Studied by Kelvin Probe Force Microscopy” Kerstin Neuhaus, Giuliano Gregori and Joachim Maier show that “the combined polarization-KPFM method is able to produce consistent results for evaluation of room temperature chemical diffusion processes. In the future, a compilation of similar experiments with variation of temperature, humidity, gas surrounding etc. could also help to further study not only the role of the microstructure but also the influence of the environment on the polarization properties of other industrially relevant oxides.” *

“The samples were first mapped in the pristine state for reference. Subsequently, the sample was polarized with up to±5 V (with regard to the AFM tip) for up to 300 s. Directly after the end of the polarization experiment continuous surface potential mapping was started.”*

“For polarization and KPFM mapping, the samples were contacted with a silver paste back contact and Pt wire. The working contact for the polarization was an AFM tip (PPP-NCSTPt) with Pt coating, which was used simultaneously as probe during KPFM mapping (cf. Fig. 1).”*

Figure 1 from "Room Temperature Polarization Phenomena in Nanocrystalline and Epitaxial Thin Films of Gd-Doped Ceria Studied by Kelvin Probe Force Microscopy": Schematic of the experimental setup, NANOSENSORS PPP-NCST-Pt AFM probes were used
Figure 1 from “Room Temperature Polarization Phenomena in Nanocrystalline and Epitaxial Thin Films of Gd-Doped Ceria Studied by Kelvin Probe Force Microscopy”: Schematic of the experimental setup

*Kerstin Neuhaus, Giuliano Gregori, Joachim Maier
Room Temperature Polarization Phenomena in Nanocrystalline and Epitaxial Thin Films of Gd-Doped Ceria Studied by Kelvin Probe Force Microscopy
ECS Journal of Solid State Science and Technology,7 (8) P362-P368 (2018)
DOI: 10.1149/2.0011808jss

The article “Room Temperature Polarization Phenomena in Nanocrystalline and Epitaxial Thin Films of Gd-Doped Ceria Studied by Kelvin Probe Force Microscopy” by Neuhaus et. al. is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/.

Happy Swiss National Holiday with Smallest Swiss Cross

Basel University : Smallest Swiss Cross – Made of 20 Single Atoms ( a NANOSENSORS PPP-NCL was used for this image)

20 bromine atoms positioned on a sodium chloride surface using the tip of an atomic force microscope at room temperature, creating a Swiss cross with the size of 5.6nm. The structure is stable at room temperature and was achieved by exchanging chlorine with bromine atoms. (Fig: University of Basel, Department of Physics), image made with NANOSENSORS PPP-NCL AFM tip
20 bromine atoms positioned on a sodium chloride surface using the tip of an atomic force microscope at room temperature, creating a Swiss cross with the size of 5.6nm. The structure is stable at room temperature and was achieved by exchanging chlorine with bromine atoms. (Fig: University of Basel, Department of Physics)

 

Long-range Stripe Nanodomains in Epitaxial (110) BiFeO 3 Thin Films on (100) NdGaO 3 Substrate

NANOSENSORS PtIr coated PPP-EFM AFM tips were used for the PFM imaging in this interesting paper.

Figure 2: AFM topography images of; (a) 130 nm BFO film grown on NGO and (b) on 100 nm LSCO layered NGO. (c,d) Section analysis along the lines drawn in (c) and (d), respectively, showing the puckering of the surfaces. from: Long-range Stripe Nanodomains in Epitaxial (110) BiFeO3 Thin Films on (100) NdGaO3 Substrate
Figure 2: AFM topography images of; (a) 130 nm BFO film grown on NGO and (b) on 100 nm LSCO layered NGO. (c,d) Section analysis along the lines drawn in (c) and (d), respectively, showing the puckering of the surfaces.
from: Long-range Stripe Nanodomains in Epitaxial (110) BiFeO3 Thin Films on (100) NdGaO3 Substrate

Yogesh Sharma, Radhe Agarwal, Charudatta Phatak, Bumsoo Kim, Seokwoo Jeon, Ram S. Katiyar & Seungbum Hong Long-range Stripe Nanodomains in Epitaxial (110) BiFeO3 Thin Films on (100) NdGaO3 Substrate,
Scientific Reports 7, Article number: 4857 (2017), doi:10.1038/s41598-017-05055-z

Abstract: Here, we report the observation of ferroelectric and ferroelastic nanodomains in (110)-oriented BiFeO3 (BFO) thin films epitaxially grown on low symmetric (100) NdGaO3 (NGO) substrate. We observed long range ordering of ferroelectric 109° stripe nanodomains separated by periodic vertical domain walls in as-grown 130 nm thick BFO films. The effect of La 0.67 Sr0.33 CoO3 (LSCO) conducting interlayer on domain configurations in BFO/NGO film was also observed with relatively short range-ordering of stripe domains due to the modified electrostatic boundary conditions in BFO/LSCO/NGO film. Additional studies on B-site doping of Nb ions in BFO films showed change in the domain structures due to doping induced change in lattice anisotropy while maintaining the stripe domain morphology with 109° domain wall. This long-range array of ferroelectric and ferroelastic domains can be useful for optoelectronic devices and ferroelastic templates for strain coupled artificial magnetoelectric heterostructures.

For the full article please follow this external link: https://www.nature.com/articles/s41598-017-05055-z.epdf

Creative CommonsThe article “Long-range Stripe Nanodomains in Epitaxial (110) BiFeO 3 Thin Films on (100) NdGaO 3 Substrate” by Yogesh Sharma et. al. is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/