A recent study presents an exciting new way to listen to 'the crackling' noise of atoms shifting at nanoscale when materials are deformed, providing potential improved methods for discontinuities in novel, new materials, such as those proposed for future domain-wall electronics. 'Crackling noise microscopy' presents a new opportunity for generating advanced knowledge about nanoscale features across a wide range of applications and material systems.
presents an exciting new way to listen to avalanches of atoms in crystals.
Jerky material movements in the form of avalanches can span many orders of magnitude in size and follow universal scaling rules described by power laws. The concept was originally studied as Barkhausen noise in magnetic materials and now is used in diverse fields from earthquake research and building materials monitoring to fundamental research involving phase transitions and neural networks.
"Our method allows us to study the crackling noise of individual nanoscale features in materials, such as domain walls in ferroelectrics," says lead author Dr Cam Phu Nguyen."The types of atom avalanches differ around these structures when the material deforms." In a first application of the new technology the UNSW researchers have used the method to investigate discontinuities in ordered materials, called domain walls.
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