Spin wave propagation in a ring-shaped magnonic waveguide

Franz Vilsmeier; Takuya Taniguchi; Michael Lindner; Christian Riedel; Christian Back

doi:10.48550/arXiv.2504.17920

Spin wave propagation in a ring-shaped magnonic waveguide

Franz Vilsmeier (Corresponding author)
, Takuya Taniguchi
, Michael Lindner
, Christian Riedel
, Christian Back

Nanomagnetism and Magnonics

Publications: Contribution to journal › Article › Peer Reviewed

Abstract

We experimentally investigate frequency-selective spin wave (SW) transmission in a micrometer-scale, ring-shaped magnonic resonator integrated with a linear yttrium iron garnet stripe. Using super-Nyquist-sampling magneto-optical Kerr effect (SNS-MOKE) microscopyand micro-focused Brillouin light scattering (μ-BLS), we probe SW dynamics in the dipolar regime under in-plane magnetization. Spatially resolved measurements reveal a sharp transmission peak at 3.92 GHz for an external field of 74 mT, demonstrating strong frequency selectivity. This behavior arises from interference and scattering among multiple SW modes in the ring, shaped by anisotropic dispersion, geometric confinement, and local magnetic field inhomogeneities. Caustic-like propagation further limits outcoupling due to fixed group velocity directions. Fourier analysis reveals discrete wavevector components consistent with quantized ring eigenmodes. μ-BLS measurements at 70 mT show a shift of the transmission peak, demonstrating tunability via the external magnetic field.

Original language	English
Article number	162405
Number of pages	9
Journal	Applied Physics Letters
Volume	127
Issue number	16
DOIs	https://doi.org/10.48550/arXiv.2504.17920 https://doi.org/10.1063/5.0287832
Publication status	Published - 20 Oct 2025

Funding

The authors gratefully acknowledge funding via INST No. 95/1580-1 FUGG.

Funders	Funder number
Deutsche Forschungsgemeinsachft (DFG)	95/1580-1 FUGG

Austrian Fields of Science 2012

103015 Condensed matter
103017 Magnetism

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10.48550/arXiv.2504.17920Licence: CC BY-NC-ND 4.0
10.1063/5.0287832Licence: CC BY-NC 4.0

Cite this

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title = "Spin wave propagation in a ring-shaped magnonic waveguide",

abstract = "We experimentally investigate frequency-selective spin wave (SW) transmission in a micrometer-scale, ring-shaped magnonic resonator integrated with a linear yttrium iron garnet stripe. Using super-Nyquist-sampling magneto-optical Kerr effect (SNS-MOKE) microscopyand micro-focused Brillouin light scattering (μ-BLS), we probe SW dynamics in the dipolar regime under in-plane magnetization. Spatially resolved measurements reveal a sharp transmission peak at 3.92 GHz for an external field of 74 mT, demonstrating strong frequency selectivity. This behavior arises from interference and scattering among multiple SW modes in the ring, shaped by anisotropic dispersion, geometric confinement, and local magnetic field inhomogeneities. Caustic-like propagation further limits outcoupling due to fixed group velocity directions. Fourier analysis reveals discrete wavevector components consistent with quantized ring eigenmodes. μ-BLS measurements at 70 mT show a shift of the transmission peak, demonstrating tunability via the external magnetic field.",

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AU - Vilsmeier, Franz

AU - Taniguchi, Takuya

AU - Lindner, Michael

AU - Riedel, Christian

AU - Back, Christian

PY - 2025/10/20

Y1 - 2025/10/20

N2 - We experimentally investigate frequency-selective spin wave (SW) transmission in a micrometer-scale, ring-shaped magnonic resonator integrated with a linear yttrium iron garnet stripe. Using super-Nyquist-sampling magneto-optical Kerr effect (SNS-MOKE) microscopyand micro-focused Brillouin light scattering (μ-BLS), we probe SW dynamics in the dipolar regime under in-plane magnetization. Spatially resolved measurements reveal a sharp transmission peak at 3.92 GHz for an external field of 74 mT, demonstrating strong frequency selectivity. This behavior arises from interference and scattering among multiple SW modes in the ring, shaped by anisotropic dispersion, geometric confinement, and local magnetic field inhomogeneities. Caustic-like propagation further limits outcoupling due to fixed group velocity directions. Fourier analysis reveals discrete wavevector components consistent with quantized ring eigenmodes. μ-BLS measurements at 70 mT show a shift of the transmission peak, demonstrating tunability via the external magnetic field.

AB - We experimentally investigate frequency-selective spin wave (SW) transmission in a micrometer-scale, ring-shaped magnonic resonator integrated with a linear yttrium iron garnet stripe. Using super-Nyquist-sampling magneto-optical Kerr effect (SNS-MOKE) microscopyand micro-focused Brillouin light scattering (μ-BLS), we probe SW dynamics in the dipolar regime under in-plane magnetization. Spatially resolved measurements reveal a sharp transmission peak at 3.92 GHz for an external field of 74 mT, demonstrating strong frequency selectivity. This behavior arises from interference and scattering among multiple SW modes in the ring, shaped by anisotropic dispersion, geometric confinement, and local magnetic field inhomogeneities. Caustic-like propagation further limits outcoupling due to fixed group velocity directions. Fourier analysis reveals discrete wavevector components consistent with quantized ring eigenmodes. μ-BLS measurements at 70 mT show a shift of the transmission peak, demonstrating tunability via the external magnetic field.

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Spin wave propagation in a ring-shaped magnonic waveguide

Abstract

Funding

Austrian Fields of Science 2012

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