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O: Fachverband Oberflächenphysik

O 110: Poster Session VIII: Poster to Mini-Symposium: Dzyaloshinskii-Moriya Interaction (DMI) in magnetic layered systems

O 110.5: Poster

Thursday, March 4, 2021, 13:30–15:30, P

Dzyaloshinskii-Moriya interaction induced by an ultrashort electromagnetic pulse: Application to coherent (anti)ferromagnetic skyrmion nucleation — •Louise Desplat¹, Sebastian Meyer², Juba Bouaziz³, Patrick M. Buhl⁴, Samir Lounis³, Bertrand Dupé^5,2,1, and Paul-Antoine Hervieux¹ — ¹Université de Strasbourg, CNRS, IPCMS, Strasbourg, France — ²Nanomat/Q-mat/CESAM, Université de Liège, Belgium — ³Peter Grünberg Institut and Institute for Advanced Simulation, FZ Jülich and JARA, Jülich, Germany — ⁴Institute of Physics, Johannes Gutenberg University Mainz, Germany — ⁵FNRS, Brussels, Belgium

We show how, at ultrashort timescales, a Dzyaloshinskii-Moriya interaction can be generated in metallic thin films by an electromagnetic pulse. This interaction originates from the spin-orbit coupling between the pulse-induced electric field and the spins of the delocalized electrons of the material¹. We perform density functional theory calculations to estimate the strength of this field-induced interaction in Fe, Co, Ni, and Mn monolayers, as well as FePt and MnPt alloys. Last, using atomistic simulations, we demonstrate how an isolated (anti)ferromagnetic skyrmion can be coherently nucleated from the collinear background by an electric field pulse at the 100-fs timescale². These results provide a new handle for an ultrafast, coherent control of noncollinear magnetic states.

[1] Imamura et al. PRB 69, 121303(R) (2014) ; Hinschberger et al., PRA 93, 042117 (2016) ; Bouaziz et al. New J. Phys. 19, 023010 (2017) [2] Desplat et al. ArXiv:2011.12055 (2020)