Dresden 2020 – scientific programme
The DPG Spring Meeting in Dresden had to be cancelled! Read more ...
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.11: Poster
Friday, March 20, 2020, 09:00–12:00, P2/EG
Symmetry of skyrmion and antiskyrmion dynamics with spin transfer and spin orbital torques — •Mariia Potkina1,2, Igor Lobanov1,2, and Valery Uzdin1,2 — 1ITMO University, Saint Petersburg, Russia — 2Saint Petersburg State University, Russia
Lattice models of skyrmions and antiskyrmions in ferromagnetic and antiferromagnetic materials are considered taking into account the Heisenberg exchange, magnetic anisotropy, Dzyaloshinskii-Moriya interaction and interaction with external magnetic field. The skyrmionic and antiskyrmionic states are shown to be in one to one correspondence under certain transformation of spin configurations and vector parameters in the Hamiltonian. Without long range magnetic dipole interaction this transformation conserves the energy of the system and the shape of the energy surface. Therefore activation energies for annihilation of both states and the prefactors in Arrhenius law for lifetime are exactly the same for correspondent structures.
For the current driven dynamics, both spin-transfer and spin-orbit torques are considered and it is demonstrated how the current has to be transformed in both cases to match the dynamics of skyrmions and antiskyrmions. This makes it possible to determine the dynamics of an antiskyrmion if the dynamics of the corresponding skyrmion is known and to predict for which orientation the antiskyrmion moves in the direction of the applied spin polarized current.
This work was funded by the Russian Science Foundation (Grant No. 19-72-10138).