Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnetic Textures: Statics and experimental imaging
MA 3.4: Vortrag
Montag, 20. März 2017, 10:15–10:30, HSZ 101
Antiskyrmions stabilized by anisotropic Dzyaloshinskii-Moriya interaction at interfaces of low symmetry — •Markus Hoffmann1, Bernd Zimmermann1, Gideon P. Müller1, Daniel Schürhoff1, Nikolai S. Kiselev1, Christof Melcher2, and Stefan Blügel1 — 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Department of Mathematics I & JARA FIT, RWTH Aachen University, 52056 Aachen, Germany
While skyrmions – localized and topologically protected vortex-like magnetic textures – are the main focus within the current research field of chiral magnets, we discuss in this contribution the emergence of antiparticles, so-called antiskyrmions, magnetic textures with a topological charge opposite to the one of skyrmions. On the level of micromagnetics, we show that chiral magnets cannot only host skyrmions, but also antiskyrmions as least-energy configurations over all non-trivial homotopy classes. We derive practical criteria for their occurrence and coexistence with skyrmions that can be fulfilled by interfaces of low symmetry in dependence of the electronic structure. We propose a whole class of materials as possible candidates for the realization of antiskyrmions, namely ultrathin magnetic films grown on heavy metal substrates with C2v symmetry. An experimentally well-investigated system of this class is the double layer of Fe grown on a W(110) substrate. Combining Density Functional Theory calculations with spin dynamic simulations employing an atomistic-spin model we show that this system hosts stable antiskyrmions rather than skyrmions.