Spin wave propagation in a ring-shaped magnonic waveguide

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

doi:10.1063/5.0287832

Spin wave propagation in a ring-shaped magnonic waveguide

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

Chair of Experimental Physics of Functional Spin-Systems

Research output: Contribution to journal › Article › peer-review

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
Journal	Applied Physics Letters
Volume	127
Issue number	16
DOIs	https://doi.org/10.1063/5.0287832
State	Published - 20 Oct 2025

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10.1063/5.0287832

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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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T1 - Spin wave propagation in a ring-shaped magnonic waveguide

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.

UR - https://www.scopus.com/pages/publications/105019217626

U2 - 10.1063/5.0287832

DO - 10.1063/5.0287832

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SN - 0003-6951

VL - 127

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 16

M1 - 162405

ER -

Spin wave propagation in a ring-shaped magnonic waveguide

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