Scientific Highlights and News

Multiresolution X-ray tomography, getting a clear view of the interior

Researchers at PSI have developed a technique that combines tomography measurements at different resolution levels to allow quantitative interpretation for nanoscale tomography on an interior region of interest of the sample. In collaboration with researchers of the institute AMOLF in the Netherlands and ETH Zurich in Switzerland they showcase their technique by studying the porous structure within a section of an avian eggshell. The detailed measurements of the interior of the sample allowed the researchers to quantify the ordering and distribution of an intricate network of pores within the shell.

Left: Structure of BaFe2As2 with the motion pattern of the A1g phonon mode (red arrows). 
Right: Pump-induced change of diffraction intensity of the (1 0 5) reflection

Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2

Understanding the interplay of the various degrees of freedom such as the electrons, spins and lattice is essential for many complex materials, including the high-temperature superconductors.

Magnetization dynamics inside a 5 µm x 5 µm structure.(a) Time-resolved PEEM images using XMCD as a magnetic contrast mechanism recorded at a given time delay t after the laser pulse and (b) extracted XMCD contrast as a function of the time delay t for three different ROI, defined in the inset image by the coloured area superimposed on the non-dichroic X-ray absorption of the structure. The 0° incoming laser direction with respect to the structure edge is indicated in the inset by the laser in-plane wave v…

Nanoscale sub-100 picosecond all-optical magnetization switching in GdFeCo microstructure

Ultrafast magnetization reversal driven by femtosecond laser pulses has been shown to be a promising way to write information. Seeking to improve the recording density has raised intriguing fundamental questions about the feasibility of combining ultrafast temporal resolution with sub-wavelength spatial resolution for magnetic recording. Here we report on the experimental demonstration of nanoscale sub-100 ps all-optical magnetization switching, providing a path to sub-wavelength magnetic recording.