ELFT HÍRADÓ

[Balazs Dora <dora.balazs AT ttk.bme.hu>]

                      MEGHÍVÓ








    a Szilárd Leó-Kollokvium előadására:


                   Felix Büttner
                (Uni. Augsburg)




“Coherent imaging with soft x-rays: An opportunity to see the interplay 
of fluctuations and disorder in magnetism"


Kivonat: Functional materials and devices often exhibit enormous 
complexity in real space. Electron microscopy is routinely used in their 
development and testing, but the approach is usually limited to static 
and destructive imaging due thickness constraints and cross-talk of the 
electron probe. X-rays, by contrast, promise non-destructive, 
in-operando, 3D microscopy on materials and devices with a rich variety 
of contrast mechanisms. However, the challenge of such imaging 
experiments is that they require exceptional spatial and temporal 
resolution, often beyond the reach of established imaging techniques. In 
this context, coherent x-ray imaging offers unique opportunities to 
overcome technological and even apparently fundamental limits.

In this talk, I will introduce the method of coherent x-ray imaging, 
including the concept of phase retrieval, which allows to reconstruct a 
real-space image from x-ray scattering data. We will understand why the 
technique yields superior spatial resolution compared to conventional 
x-ray microscopy, and by which means it can even capture stochastic 
dynamics. Using this technique, we are able to observe the interaction 
of magnetic domain walls with magnetic pinning sites in space and time, 
and even quantify the micromagnetic energy behind such pinning. I will 
conclude with a perspective on the future of coherent imaging at 
upcoming light sources.




Helye: BME Fizikai Intézet, Fizika Tanszék
Budafoki út 8. F-épület, 2. emelet, 13-as terem


Ideje: 2025. február 18. (kedd), 14:30.
Kapunyitás 14:14-től.
Program: http://physics.bme.hu/kollokvium


Minden érdeklődőt szívesen látunk!




Dóra Balázs és Zaránd Gergely