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VIDEO DOI: https://doi.org/10.48448/8znq-kd80

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Zero field Magnetic Skyrmions in Multilayer Films Stabilized by Interplay of Interlayer Exchange Couplings

Magnetic skyrmions are promising candidates for achieving low-power, next-generation edge computing devices due to their particle-like nature, efficient coupling to electrical and spin currents and room-temperature stability in multilayer films 1. However, in most skyrmion-hosting multilayers, the predominant magnetic textures at zero-field (ZF) are labyrinthine stripes 2. External applied magnetic fields or geometric confinement 3 are typically used to stabilize isolated skyrmions, which limits their practicality.

In this work, we design multilayers comprising three adjoining functional stacks – two repeats of skyrmion-hosting multilayers and a bias layer – coupled by two tunable interlayer exchange couplings (IECs) 4,5. Using Lorentz transmission electron microscopy (LTEM), we demonstrate that these two IECs act as coarse and fine-tuning knobs that determine skyrmion stability and density. With micromagnetic simulations, we elucidate the unique roles played by each of the couplings and establish the advantage of a duo-IEC system in applications. This work establishes and extends the use of IEC as a means of stabilizing and shaping ZF skyrmions and paves the path to skyrmion-based devices.

References 1 A. Fert, N. Reyren, and V. Cros, Magnetic Skyrmions: Advances in Physics and Potential Applications, Nat. Rev. Mater. 2, natrevmats201731 (2017). 2 X. Chen, M. Lin, J. F. Kong, H. R. Tan, A. K. C. Tan, S.-G. Je, H. K. Tan, K. H. Khoo, M.-Y. Im, and A. Soumyanarayanan, Unveiling the Emergent Traits of Chiral Spin Textures in Magnetic Multilayers, Adv. Sci. 9, 2103978 (2022). 3 P. Ho, A. K. C. Tan, S. Goolaup, A. L. G. Oyarce, M. Raju, L. S. Huang, A. Soumyanarayanan, and C. Panagopoulos, Geometrically Tailored Skyrmions at Zero Magnetic Field in Multilayered Nanostructures, Phys. Rev. Appl. 11, 024064 (2019). 4 G. Chen, A. Mascaraque, A. T. N’Diaye, and A. K. Schmid, Room Temperature Skyrmion Ground State Stabilized through Interlayer Exchange Coupling, Appl. Phys. Lett. 106, 242404 (2015). 5 W. Legrand, D. Maccariello, F. Ajejas, S. Collin, A. Vecchiola, K. Bouzehouane, N. Reyren, V. Cros, and A. Fert, Room-Temperature Stabilization of Antiferromagnetic Skyrmions in Synthetic Antiferromagnets, Nat. Mater. 19, 34 (2019).


Transcript English (automatic)

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