4.6 Article

Topological gauge field in nanomagnets: Spin-wave excitations over a slowly moving magnetization background

Journal

PHYSICAL REVIEW B
Volume 81, Issue 1, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.014414

Keywords

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Funding

  1. Basque Science Foundation
  2. JAEdoc of the CSIC (Spain)
  3. SAIOTEK [S-PC09UN03]

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We introduce a topological gauge vector potential which influences spin-wave excitations over arbitrary nonuniform, slowly moving magnetization background. The time component of the gauge potential plays a principal role in the magnetization dynamics of typical magnetic nanostructures. As an example, we consider spin modes excited in the vortex-state magnetic dots. The vortex-spin-wave interaction is described as a consequence of the gauge field arising due to the moving vortex magnetization. The approach yields a giant frequency splitting of the spin waves having nonzero overlapping with the vortex background mode as well as a finite vortex mass of dynamical origin.

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