Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 54: Spin Hall Effects and Skyrmions II
MA 54.3: Talk
Thursday, March 23, 2017, 15:30–15:45, HSZ 04
Edge instabilities and skyrmion creation in magnetic layers — •Jan Müller1, Achim Rosch1, and Markus Garst2 — 1Institut für Theoretische Physik, Universität zu Köln, D-50937 Köln, Germany — 2Institut für Theoretische Physik, Technische Universität Dresden, D-01062 Dresden, Germany
We study both analytically and numerically the edge of two-dimensional ferromagnets with Dzyaloshinskii-Moriya (DM) interactions, considering both chiral magnets and magnets with interface-induced DM interactions. We show that in the field-polarized (FP) ferromagnetic phase magnon states exist which are bound to the edge, and we calculate their spectra within a continuum field theory. Upon lowering an external magnetic field, these bound magnons condense at a finite momentum and the edge becomes locally unstable. Micromagnetic simulations demonstrate that this edge instability triggers the creation of a helical phase which penetrates the FP state within the bulk. A subsequent increase of the magnetic field allows to create skyrmions close to the edge in a controlled manner.