Opinn fyrirlestur: Rúmfræði hreyfifræðilegra eiginleika skyrmeinda

Eðlisvísindastofnun býður á opinn fyrirlestur

Vladyslav M. Kuchkin, doktorsnemi við Institute for Advanced Simulation & Peter Grünberg Institute, Forschungszentrum Jülich, Þýskalandi flytur gestafyrirlesturinn Geometry of skyrmion dynamics (Rúmfræði hreyfifræðilegra eiginleika skyrmeinda)

Ágrip (Enska) 

The 2D model of the chiral magnet is rich from the point of view of the existing diversity of localized magnetic solitons – skyrmions. Their static and dynamic properties have been under intensive study for a few last decades. However, the recently found new types of skyrmions such as skyrmion bags and skyrmions with chiral kinks indicate that our understanding of all properties of magnetic solitons in chiral magnets is not complete, and many things still have to be studied. In my talk, I focus mainly on the dynamics of these skyrmions induced by the Zhang-Li spin-transfer torque. The uniform motion of skyrmions caused by such torque displays an intricate dependency on the skyrmions' topological charge and shape. In our recent publication, we reveal surprising patterns in the velocity distribution for different skyrmions obtained in a numerical experiment based on the simulations with the Landau-Lifshitz-Gilbert equation. We explain observed velocity dependencies through the geometric analysis of Thiele's equation. Our results provide a universal geometrical understanding of the steady motion of skyrmions and skyrmion Hall angle on the topological charge, shape, and orientation of the skyrmions. The generality of our approach suggests the validity of our results for exchange-frustrated magnets, bubble materials, and other magnetic systems.

Um Vladyslav:

Vlad Kuchkin lauk BA- og MS prófi frá Kyiv Polytechnic Institute í Úkraínu. Meistaraverkefni hans fjallaði um andjárnsegla og var unnið undir leiðsögn Helen Gomonay. Síðustu þrjú ár hefur hann verið doktorsnemi við Forschungszentrum Jülich í Þýskalandi þar sem hann vinnur ásamt leiðbeinendum sínum þeim Nikolai Kiselev og Stefan Blügel við rannsóknir meðal annars  á hreyfifræði í hendnum seglum.