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February 25th, 2010
The electro-mechanical coupling behaviour of many materials in systems from bio
Fig 1. Schematic set-up of a scanning force probe operating as a Piezoresponse Force Microscope. If you’d like to see full animations, please, visit this page. For in-depth information on how NTEGRA nanolaboratory can be used for investigation of low-voltage memories in PFM see Nature Materials 8, 62 - 67 (2009)
The imaging of ferroelectric domains using this technique is possible due to the fact that ferroelectric behaviour implies piezoelectricity, and consequently mapping the piezoelectric response of a material provides a direct image of its ferroelectric domain structure.
Hexagonal Domains in Lithium Niobate
Fig 2.The image illustrates the hexagonal domain structure of Lithium Niobate – a structure typically produced by the room temperature electric field poling. Lithium Niobate is an important material for use in telecommunications and optical devices such as wave guides and modulators.The sample was kindly given by C. Gawith, Optoelectronics Research Centre University of Southampton. Image courtesy of T. Jungk, A. Hoffmann, E. Soergel, University of Bonn.
Ferroelectric Domain Patterns in Multiferroic Manganite
Fig 3.The image was produced from the polished surface of a z-cut ferroelectric single crystal using PFM. The irregular nature of the image illustrates breaking ferroelectric order by the random fields. Scan size 50 x 50 μm, produced using a NTEGRA Solaris system with AFM head. The sample was kindly given by Dr. M. Fiebig. Image Courtesy Dr. T. Jungk, Dr. F. Johann, Dr. A. Hoffmann, Dr. E. Soergel, University of Bonn, Germany
A typical PFM set-up would utilise NTEGRA Aura image recording with DCP11 probes.
Fig 4. Probe NanoLaboratory NTEGRA Aura is intended for studies in the conditions of controlled environment and low vacuum.
Fig 5. DCP 11 Probe. Left picture – tip with diamond coating. Typical curvature radius of a tip: 70 nm. Right picture: tip height: 10 - 15 μm.