Spin pinning and spin-wave dispersion in nanoscopic ferromagnetic waveguides

Q. Wang; B. Heinz; R. Verba; M. Kewenig; P. Pirro; M. Schneider; T. Meyer; B. Lägel; C. Dubs; T. Brächer; A. V. Chumak

doi:10.1103/PhysRevLett.122.247202

Spin pinning and spin-wave dispersion in nanoscopic ferromagnetic waveguides

Mesoscale and Nanoscale Physics 2019-06-26 v3 Applied Physics

Authors: Q. Wang , B. Heinz , R. Verba , M. Kewenig , P. Pirro , M. Schneider , T. Meyer , B. Lägel , C. Dubs , T. Brächer , A. V. Chumak

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Abstract

Spin waves are investigated in Yttrium Iron Garnet (YIG) waveguides with a thickness of 39 nm and widths ranging down to 50 nm, i.e., with aspect ratios thickness over width approaching unity, using Brillouin Light Scattering spectroscopy. The experimental results are verified by a semi-analytical theory and micromagnetic simulations. A critical width is found, below which the exchange interaction suppresses the dipolar pinning phenomenon. This changes the quantization criterion for the spin-wave eigenmodes and results in a pronounced modification of the spin-wave characteristics. The presented semi-analytical theory allows for the calculation of spin-wave mode profiles and dispersion relations in nano-structures.

Keywords

spin waves yttrium iron garnet nanowaveguides spin pinning spin-wave dispersion micromagnetic simulations brillouin light scattering

Cite

@article{arxiv.1807.01358,
  title  = {Spin pinning and spin-wave dispersion in nanoscopic ferromagnetic waveguides},
  author = {Q. Wang and B. Heinz and R. Verba and M. Kewenig and P. Pirro and M. Schneider and T. Meyer and B. Lägel and C. Dubs and T. Brächer and A. V. Chumak},
  journal= {arXiv preprint arXiv:1807.01358},
  year   = {2019}
}

Spin pinning and spin-wave dispersion in nanoscopic ferromagnetic waveguides

Abstract

Keywords

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