Karin Dahmen of Urbana gave a wonderful talk at KITP on similarity between Berkhausen avalanches in magnetic materials and earthquakes. Crackling noise you hear when you pour milk onto the rice crispies, the noise due to switching of magnetic domains, and the avalanches/earthquakes have a lot in common.
KITP archive also has another talk on the same fascinating topic by Karin from 2005.
Categories: magnetism · talks
Tagged: avalanches, Berkhausen noise, earthquakes, magentic domans, rice criscpies
Kavli Institute on Theoretical Physics at Santa Barbara, KITP, has a great program of posting videos and slides of their numerous talks online. (You can also subscribe to their numerous RSS feeds and get them as podcasts)
This week I listened to an excellent talk by Seamus Davis of Cornell on Atomic Scale Visualization of ‘Pseudogap’ Electronic Matter in Cuprates .
This talk was a part of an on-going symposium on strongly correlated systems and cold atoms. There was also another talk by Davis a few days before, providing a nice introduction to STS and d-wave superconductivity.
Categories: electron microscopy · high Tc · talks
The title should be pronounced using your best Homer Simpson voice.
PIE stands for “Ptychographical Iterative Engine”, and it’s the most interesting development in lens-less imaging this year. The idea is to use diffraction patterns from overlapping regions (which look like a Venn diagram, or olympic logo) by moving an aperture by a known amount, and use this knowledge to speed up real-space reconstruction process.
The most recent PRL paper is by John Roderburg, and was listed in my GoogleNews feed soon after it came out in January of this year. This most recent work is an experimental extension of simulations done previously by Faulkner and Rodenburg.
This week’s Journal Club update is inspired by yesterday’s colloquium by Helmut Dosch, one of the directors of Max Planck institute. His excellent talk was on solid-liquid interfaces, one of the most puzzling and inaccessible types of interfaces. Solids and liquids have very different properties, and what happens (on atomic scale) when the two of them meet is currently not known. Little of what is known can be attributed to Max Planck/Stuttgart group lead by Dosch – it could be argued his group made more progress than the rest of the world combined. Here’s a sampler of some of the work Helmut described, with majority already featured in our shared liquids topic news selection.
X-ray Papers Coherent X-ray Scattering Electronic and Magnetic Materials Papers Soft Matter Papers Liquids Papers Glasses Papers