Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 54: Spin Hall Effects and Skyrmions II
MA 54.4: Vortrag
Donnerstag, 23. März 2017, 15:45–16:00, HSZ 04
Skyrmion-Antiskyrmion pair creation by in-plane currents — •Martin Stier1, Wolfgang Häusler2, Thore Posske1, Gregor Gurski1, and Michael Thorwart1 — 1Universität Hamburg, Germany — 2Universität Augsburg, Germany
Magnetic Skyrmions are considered to be topologically protected particles. Due to this stability, their small size and the possibility to move them by low electric currents they are proper candidates for spintronic devices. However, without violating this topological protection, it is should be possible to create Skyrmion-Antiskyrmion pairs as long as the total Skyrmion number does not change. In fact, we derive a Skyrmion equation of motion and show that electric currents can create such Skyrmion-Antiskyrmion pairs. By this equation of motion we are able to give general prerequisites for this pair creation process. We confirm these results by numerical simulations. On a lattice, where topological protection gets imperfect, the Antiskyrmions in these pairs can be destroyed and only the Skyrmions remain. This eventually changes the total Skyrmion number and yields new ways of creating and controlling Skyrmions.