Observation of hydrogen-induced Dzyaloshinskii-Moriya interaction and reversible switching of magnetic chirality

Abstract

The Dzyaloshinskii-Moriya interaction (DMI) has drawn great attention as it stabilizes magnetic chirality, with important implications in fundamental and applied research. This antisymmetric exchange interaction is induced by the broken inversion symmetry at interfaces or in non-centrosymmetric lattices. Significant interfacial DMI was found often at magnetic / heavy-metal interfaces with large spin-orbit coupling. Recent studies have shown promise of induced DMI at interfaces involving light elements such as carbon (graphene) or oxygen. Here we report direct observation of induced DMI by chemisorption of the lightest element, hydrogen, on a ferromagnetic layer at room temperature, which is supported by density functional theory calculations. We further demonstrate a reversible chirality transition of the magnetic domain walls due to the induced DMI via hydrogen chemisorption/desorption. These results shed new light on the understanding of DMI in low atomic number materials and design of novel chiral spintronics and magneto-ionic devices.

20 pages, 3 figures. 3 pages Supplemental Materials with 2 figures. To appear in Physical Review X

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• Electrically Enhanced Exchange Bias via Solid State Magneto-Ionics
• Spin-orbit enabled all-electrical readout of chiral spin-textures
• Chirality-Induced Noncollinear Magnetization and Asymmetric Domain-Wall Propagation in Hydrogenated CoPd Thin Films
• Electric-field-induced formation and annihilation of skyrmions in two-dimensional magnet
• Nature of Interfacial Dzyaloshinskii-Moriya Interactions in Graphene/Co/Pt(111) Multilayer Heterostructures
• Ultrasensitive Sub-monolayer Palladium Induced Chirality Switching and Topological Evolution of Skyrmions
• Ultra-sensitive voltage-controlled skyrmion-based spintronic diode
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• Magneto-Ionic Physical Reservoir Computing
• Machine-Learning Recognition of Dzyaloshinskii-Moriya Interaction from Magnetometry
• Ionically-Driven Synthesis and Exchange Bias in Mn${}_4$N/MnN${}_x$ Heterostructures
• Chirality-induced zigzag domain wall in in-plane magnetized ultrathin films
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• Hydrogen toggling between Yoshimori spin spirals and elliptical Dzyaloshinskii-Moriya skyrmions in Fe on Ir(110)
• Dynamic nanoscale spatial heterogeneity in a perovskite to brownmillerite topotactic phase transformation