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arXiv · 2203.00066

Magnetic Interactions of the Centrosymmetric Skyrmion Material Gd2PdSi3

Joseph A. M. Paddison·Binod K. Rai·Andrew F. May·Stuart A. Calder·Matthew B. Stone·Matthias D. Frontzek·Andrew D. Christianson
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Abstract

The experimental realization of magnetic skyrmions in centrosymmetric materials has been driven by theoretical understanding of how a delicate balance of anisotropy and frustration can stabilize topological spin structures in applied magnetic fields. Recently, the centrosymmetric material Gd$_{2}$PdSi$_{3}$ was shown to host a field-induced skyrmion phase, but the skyrmion stabilization mechanism remains unclear. Here, we employ neutron-scattering measurements on an isotopically-enriched polycrystalline Gd$_{2}$PdSi$_{3}$ sample to quantify the interactions that drive skyrmion formation. Our analysis reveals spatially-extended interactions in triangular planes that are consistent with an RKKY mechanism, and large ferromagnetic inter-planar magnetic interactions that are modulated by the Pd/Si superstructure. The skyrmion phase emerges from a zero-field helical magnetic order with magnetic moments perpendicular to the magnetic propagation vector, indicating that the magnetic dipolar interaction plays a significant role. Our experimental results establish an interaction space that can promote skyrmion formation, facilitating identification and design of centrosymmetric skyrmion materials.

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Joseph A. M. Paddison, Binod K. Rai, Andrew F. May, Stuart A. Calder, Matthew B. Stone, Matthias D. Frontzek, Andrew D. Christianson. 2022-02-28. Magnetic Interactions of the Centrosymmetric Skyrmion Material Gd2PdSi3. https://doi.org/10.1103/physrevlett.129.137202

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