Journal
NANO LETTERS
Volume 21, Issue 17, Pages 7138-7144Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01713
Keywords
spintronics; Dzyaloshinskii-Moriya interaction; magnetocrystalline anisotropy; 2D material/transition metal interfaces; skyrmions
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Funding
- European Union [785219, 881603]
- National Natural Science Foundation of China [11874059]
- Key Research Program of Frontier Sciences, CAS [ZDBS-LY-7021]
- Beijing National Laboratory for Condensed Matter Physics
- Zhejiang Provincial Natural Science Foundation of China [LR19A040002]
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By comparing the behavior of Dzyaloshinskii-Moriya interaction (DMI) and perpendicular magnetic anisotropy (PMA) at graphene/Co and h-BN/Co interfaces, it is found that the latter shows slightly larger DMI and similar PMA, which leads to the formation of skyrmions under thicker Co layers.
We report a significant Dzyaloshinskii-Moriya interaction (DMI) and perpendicular magnetic anisotropy (PMA) at interfaces comprising hexagonal boron nitride (h-BN) and Co. By comparing the behavior of these phenomena at graphene/Co and h-BN/Co interfaces, it is found that the DMI in the latter increases as a function of Co thickness and beyond three monolayers stabilizes with 1 order of magnitude larger values compared to those at graphene/Co, where the DMI shows opposite decreasing behavior. Meanwhile, the PMA for both systems shows similar trends with larger values for graphene/Co and no significant variations for all thickness ranges of Co. Furthermore, using micromagnetic simulations we demonstrate that such significant DMI and PMA values remaining stable over a large range of Co thickness give rise to the formation of skyrmions with small applied external fields. These findings open up further possibilities toward integrating twodimensional (2D) materials in spin-orbitronics devices.
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