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MA: Fachverband Magnetismus
MA 47: Poster III
MA 47.11: Poster
Thursday, March 21, 2024, 15:00–18:00, Poster D
Ab-inito prediction of chiral spin structures in antiferromagnetic MnN based thin films — •Victor Deinhart1,2,3, Stefan Blügel2, and Felix Büttner1,3 — 1Helmholtz-Zentrum Berlin, 14109 Berlin, Germany — 2Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 3Universität Augsburg, 86159 Augsburg, Germany
Chiral magnetic structures are non-trivial spin structures with a topological charge and can exist in host materials with perpendicular magnetic anisotropy (PMA) where stray fields and Dzyaloshinskii-Moriya interaction (DMI) stabilize them. While chiral structures are readily observed in ferromagnetic materials, their existence in natural antiferromagnets (AFM) has still to be shown. To identify material systems able to host chiral spin structures, we study AFM/heavy metal heterostructures with the aim to stabilize these via spin-orbit interaction induced DMI. Herein, we focus on systems based on θ-MnN, the nitrogen richest phase of all MnN based compounds, featuring an antiferromagnetic ordering and PMA [1]. We present ab-initio calculations of the magnetic exchange interactions based on the FLEUR density functional theory code. Via subsequent atomistic spin simulations, the stability and properties of possible chiral spin structures in the considered thin film systems are analyzed and the most promising material systems for future experimental realization are discussed.
[1] Zilske et al., Appl. Phys. Lett. 110, 192402 (2017)
Keywords: Antiferromagnetism; Thin films; Chiral spin structures; Heterostructure; DFT