ELFT HÍRADÓ

[Dr. Dóra Balázs <dora.balazs AT ttk.bme.hu>]

    MEGHÍVÓ








     a Szilárd Leó-Kollokvium előadására:


                      Stefan Blügel
          (F. Jülich)




“Nanoscale skyrmions in magnets"


Kivonat: The soliton phenomenon was first described in 1834 by John Scott 
Russell who observed a wave in the Union Canal in Scotland that preserves its 
shape while propagating freely, at constant velocity, and recovers it even 
after collisions with other such localized wave packets. 1961 Tony Skyrme 
identified topologically stable three-dimensional configurations in a pion 
field as baryons.   Nowadays we find a lot of similar phenomena in magnetic 
textures, but not only in one dimension as in domain walls or in the Union 
Canal, respectively, but also in two and three dimensions known as skyrmions 
and hopfions, respectively. Actually, we have now a zoo of particles 
predicted and also observed using a spectrum of experimental techniques such 
as spin-polarized scanning tunneling microscopy, Lorentz microscopy, electron 
microscopy with off-axis holography, or x-ray scattering. In this colloquium, 
I will introduce these particles, their topological nature, give arguments of 
their stability, discuss their lifetime, dynamics, their transport 
properties, and their potential field of applications. I relate their 
stability to underlying microscopic interactions and look at promising 
materials realizations by applying a multiscale simulation approach combining 
first-principles calculations with atomistic simulations.





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


Ideje: 2023. november 7. (kedd), 14:30.
Kapunyitás 14:15-től.
Program: http://physics.bme.hu/kollokvium


Minden érdeklődőt szívesen látunk!




Dóra Balázs és Zaránd Gergely