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arXiv · 2512.24091

Thermal Evolution of Skyrmions in Synthetic Ferrimagnets of Co/Gd Heterostructure for Topological Spintronic Applications

Bhuvneshwari Sharma·Soumyaranjan Dash·Shaktiranjan Mohanty·Brindaban Ojha·Debi Rianto·Del Atkinson·Sanjeev Kumar·Subhankar Bedanta
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Abstract

Synthetic ferrimagnetic (SFiM) multilayers offer a versatile platform for hosting skyrmions with tunable magnetic properties, combining the advantages of ferromagnets and antiferromagnets. Unlike synthetic antiferromagnets, SFiMs retain a finite magnetization that allows direct observation of magnetic textures while still benefiting from reduced dipolar fields and a suppressed skyrmion Hall effect. However, a systematic investigation of their temperature and field dependent magnetization evolution, including the labyrinthine-to-skyrmion transition in Co/Gd-based SFiMs, remains less explored. Here, we demonstrate the stabilization of 70 nm-radius skyrmions at room temperature and reveal how the Co and Gd sublattices influence the temperature-dependent net magnetization. Further, we develop a microscopic spin model for SFiM incorporating the relevant magnetic interactions, which reproduces the experimental observations and captures the temperature-dependent magnetic phase evolution. This framework highlights the interplay of fundamental interactions controlling skyrmion stability in SFiM and provides a pathway for engineering heterostructures for topological spintronic applications.

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Bhuvneshwari Sharma, Soumyaranjan Dash, Shaktiranjan Mohanty, Brindaban Ojha, Debi Rianto, Del Atkinson, Sanjeev Kumar, Subhankar Bedanta. 2025-12-30. Thermal Evolution of Skyrmions in Synthetic Ferrimagnets of Co/Gd Heterostructure for Topological Spintronic Applications. https://arxiv.org/abs/2512.24091

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