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  • Accepted Paper

Evolution of zero-field skyrmionic states in exchange-coupled composite multilayer nanodots

Phys. Rev. Applied
Alexander Kang-Jun Toh, McCoy W. Lim, T. S. Suraj, Xiaoye Chen, Hang Khume Tan, Royston Lim, Xuan Min Cheng, Nelson Lim, Sherry Yap, Durgesh Kumar, S. N. Piramanayagam, Pin Ho, and Anjan Soumyanarayanan
Accepted
17 June 2024

Abstract

Ambient magnetic skyrmions stabilized in multilayer nanostructures are of immense interest due to their relevance to magnetic tunnel junction (MTJ) devices for memory and unconventional computing applications. However, existing skyrmionic nanostructures built using conventional metallic or oxide multilayer nanodots are unable to concurrently fulfill the requirements of nanoscale skyrmion stability and feasibility of all-electrical readout and manipulation. Here, we develop a few-repeat hybrid multilayer platform consisting of metallic [Pt/CoB/Ir]3 and oxide [Pt/CoB/MgO] components that are coupled to evolve together as a single, composite stack. Zero field (ZF) skyrmions with sizes as small as 50 nm are stabilized in the hybrid multilayer nanodots, which are smoothly modulated by up to 2by varying CoB thickness and dot sizes. Meanwhile, skyrmion multiplets are also stabilized by small bias fields. Crucially, we observe higher order “target” skyrmions with varying magnetization rotations in moderately-sized, low-anisotropy nanodots. These results provide a viable route to realize long-sought skyrmionic MTJ devices and new possibilities for multi-state skyrmionic device concepts.

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