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MA: Fachverband Magnetismus

MA 3: Spin-Dependent Phenomena in 2D

MA 3.2: Vortrag

Montag, 5. September 2022, 09:45–10:00, H43

Electric-field control of the DMI in magnetic heterostructures — •Donya Mazhjoo, Gustav Bihlmayer, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425 Jülich, Germany

The use of external electric fields can extend the exploration of spintronic devices with a tunable Dzyaloshinskii-Moriya interaction (DMI) by allowing control of the interfacial DMI. Moreover, the magnetocrystalline anisotropy energy (MAE) changes as function of electric field intensity. By using density functional theory as implemented in the Fleur-code [1], we investigated the electric field effects on graphene (Gr) covered Co/Pt(111) heterostructures. Experiments show evidence of a sizable DMI at the Gr/Co interface which partially compensates the spin-orbit coupling induced DMI at the Co/Pt interface [2], which could make these structures susceptible to electric fields. To stimulate their influence, we sandwiched the film between two electrodes of opposite polarity. The self-consistent spin-spiral calculations were performed with these changed boundary conditions and spin-orbit effects were included in first order perturbation theory for the DMI and self-consistently for the MAE. We demonstrate that external fields lead to modulation of the spin-orbit induced quantities that allow a tuning of properties like domain wall widths or skyrmion radii. Support from the FLAG-ERA JTC 2019 grant SOgraphMEM is gratefully acknowledged.

[1] https://www.flapw.de

[2] F. Ajejas et al. Nano Lett. 2018, 18, 5364-5372