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MA: Fachverband Magnetismus
MA 43: Focus Session: Higher-Order Magnetic Interactions – Implications in 2D and 3D Magnetism I
MA 43.4: Vortrag
Donnerstag, 19. März 2020, 11:00–11:15, HSZ 04
The chiral biquadratic pair interaction — •Sascha Brinker, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany
The Dzyaloshinskii-Moriya interaction being chiral and driven by relativistic effects, leads to the stabilization of highly-noncollinear spin textures such as skyrmions, which thanks to their topological nature are promising building blocks for magnetic data storage and processing elements.
Here, we reveal and study a new chiral pair interaction, Cij→·(Si→ × Sj→) (Si→ · Sj→), which is the biquadratic equivalent of the Dzyaloshinskii-Moriya interaction.
First, we derive this interaction and its guiding principles from a microscopic model, and we connect the atomistic form to the micromagnetic one.
Second, we study its properties in the simplest prototypical systems, magnetic 3d transition metal dimers deposited on surfaces, resorting to systematic first-principles calculations.
Lastly, we discuss its importance and implications not only for magnetic dimers but also for extended systems, namely one-dimensional spin spirals and complex two-dimensional magnetic structures, such as a nanoskyrmion lattice found in an Fe monolayer on Ir(111).
This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (ERC Consolidator Grant No. 681405 DYNASORE).
S. Brinker et al., New J. Phys. 21, 083015 (2019)