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Emergence of Sizeable Interfacial Dzyaloshinskii-Moriya Interaction at Cobalt/Fullerene Interface
Phys. Rev. Applied 19, 044013 – Published 5 April, 2023
DOI: https://doi.org/10.1103/PhysRevApplied.19.044013
Abstract
The interfacial Dzyaloshinskii-Moriya interaction (iDMI) originating from a heavy-metal/ferromagnet (FM) interface plays a crucial role in stabilizing chiral spin textures in magnetic multilayers. Recently, graphene based on the low-spin-orbit-coupling (SOC) element carbon () has shown a significant iDMI owing to the Rashba SOC when deposited on top of . A similar enhanced SOC has been reported earlier for other allotropes, namely fullerene () and carbon nanotubes, and a sizeable DMI can be expected to emerge from them. In this context, we elucidate the magnetization-reversal mechanism, the domain-wall (DW) dynamics, and the strength of the iDMI in a system with varying . The field-induced DW velocity measured in the creep region shows a DW velocity 2 orders of magnitude higher for a sample with 1.6 nm of , due to a lower depinning field and spin-dependent hybridization at the interface. Further, DMI measurements performed by use of the asymmetric DW expansion method exhibit a systematic increase in the iDMI from to with an increase in . Such an enhanced iDMI turns an achiral Bloch wall into a chiral Néel wall. The emergence of a finite DMI () from the interface is particularly encouraging for the use of -based materials in chiral-DW-based device applications.
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