These days, Tom is visiting the Institute of Rock Magnetism (IRM) at the University of Minnesota. His third visit to the IRM, he is working on maintaining his record on the longest-running experiment on a single-sample: Studying the viscous behaviour of single-domain assemblages like magnetoferritin and the infamous Tiva Canyon Tuff in the IRM’s two MPMS.
We modelled magnetosomes of various sizes and geometries in the full micro-magnetic model MERRILL. Our first preliminary results show very interesting phenomena such as super-vortex states for larger magnetosomes. We are also investigating the different switching modes of magnetosomes, such as coherent rotation, alternating rotation and vortex rotation.
Tom went to sample storm flood boulders in Scotland. These boulders, some of them several meters large, have been emplaced by recent storm floods.
Tom recently went to Cape Verde together with Dr. Ricardo Ramalho to sample tsunami deposits of an ancient mega-tsunami. These deposits, first found by Ricardo and published in Science Advances, were created 73,000 years ago during a flank collapse of nearby Fogo Volcano that caused a tsunami wave of at least 170 meters height. At PKU we are now working on a new method to date tsunami deposits that were previously impossible to date using conventional methods such as cosmogenic dating.
Liao and Tom recently visited the Integrated Ocean Drilling Program (IODP) center in College Station, Texas to analyse sediment cores obtained during IODP expedition 371 to the Tasman Sea. They performed X-ray fluorescence experiments on the cores, a technique that allows to determine chemical compositions of the sediments at very high speeds. This will allow to correlate variations in the magnetic signals, for example, NRM intensities, with variations in iron content along the section.
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