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<p>Understanding the formation of skyrmions in centrosymmetric materials is a problem of fundamental and technological interest. GdRu<sub>2</sub>Si<sub>2</sub> is a candidate material that hosts a variety of multi-Q magnetic phases, including in zero-field. Here, inelastic neutron scattering is used to measure the spin excitations in the field-polarized phase of GdRu<sub>2</sub>Si<sub>2</sub>. Linear spin wave theory and a method of interaction invariant path analysis are used to derive a Hamiltonian accounting for the spectra. The Hamiltonian, dominated by bilinear (Ruderman-Kittel-Kasuya-Yosida) Heisenberg exchange, compares favorably to ab initio calculations. Dipolar interactions are a secondary energy scale to consider, with <i>J</i><sub>D.D</sub>~ 0.05<i>J</i><sub>RKKY</sub>. However, it is shown that in the field-polarized phase the dipolar interactions ‘self screen’ so that their effect is largely suppressed. No specific evidence for higher-order exchange is found. These aspects are discussed in the context of the lower field multi-Q states and the anisotropy of the system.</p>

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A magnon band analysis of GdRu2Si2 in the field-polarized state

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月16日

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  • G. D. A. Wood,
  • J. R. Stewart,
  • D. A. Mayoh,
  • J. A. M. Paddison,
  • J. Bouaziz,
  • S. M. Tobin,
  • O. A. Petrenko,
  • M. R. Lees,
  • P. Manuel,
  • J. B. Staunton,
  • G. Balakrishnan

摘要

Understanding the formation of skyrmions in centrosymmetric materials is a problem of fundamental and technological interest. GdRu2Si2 is a candidate material that hosts a variety of multi-Q magnetic phases, including in zero-field. Here, inelastic neutron scattering is used to measure the spin excitations in the field-polarized phase of GdRu2Si2. Linear spin wave theory and a method of interaction invariant path analysis are used to derive a Hamiltonian accounting for the spectra. The Hamiltonian, dominated by bilinear (Ruderman-Kittel-Kasuya-Yosida) Heisenberg exchange, compares favorably to ab initio calculations. Dipolar interactions are a secondary energy scale to consider, with JD.D~ 0.05JRKKY. However, it is shown that in the field-polarized phase the dipolar interactions ‘self screen’ so that their effect is largely suppressed. No specific evidence for higher-order exchange is found. These aspects are discussed in the context of the lower field multi-Q states and the anisotropy of the system.