Exchange spin-wave propagation in Ga:YIG nanowaveguides

Andrey A. Voronov; Khrystyna O. Levchenko; Roman Verba; Kristýna Davídková; Carsten Dubs; Michal Urbánek; Qi Wang; Dieter Suess; Claas Abert; Andrii V. Chumak

arXiv · 2509.05050

Exchange spin-wave propagation in Ga:YIG nanowaveguides

Andrey A. Voronov·Khrystyna O. Levchenko·Roman Verba·Kristýna Davídková·Carsten Dubs·Michal Urbánek·Qi Wang·Dieter Suess·Claas Abert·Andrii V. Chumak

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Abstract

Spin-wave-based computing has emerged as a promising approach to overcome the fundamental limitations of CMOS technologies. However, the increasing demand for device miniaturization down to a 100 nm scale presents significant challenges for long-distance spin-wave transport. Gallium-substituted yttrium iron garnet (Ga:YIG) offers a potential solution to these challenges due to its unique magnetic properties. The reduced saturation magnetization in Ga:YIG enables efficient excitation of exchange-dominated spin waves, which exhibit enhanced transport characteristics compared to dipolar-dominated modes in conventional materials. Here, we present the first comprehensive study combining experimental, analytical, and numerical investigations of spin-wave propagation in Ga:YIG waveguides down to 145 nm width and 73 nm thickness. Using micro-focused Brillouin light scattering spectroscopy, TetraX simulations, and analytical dispersion calculations, we demonstrate that Ga:YIG waveguides support spin waves with significantly higher group velocities up to 600 m/s. This value remains constant for structures with different widths, leading to longer spin-wave propagation lengths in nanowaveguides compared to non-substituted YIG. These results reveal that gallium substitution provides access to faster and longer-lived spin waves, opening new possibilities for implementing this material in nanoscale magnonic devices.

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Andrey A. Voronov, Khrystyna O. Levchenko, Roman Verba, Kristýna Davídková, Carsten Dubs, Michal Urbánek, Qi Wang, Dieter Suess, Claas Abert, Andrii V. Chumak. 2025-09-05. Exchange spin-wave propagation in Ga:YIG nanowaveguides. https://arxiv.org/abs/2509.05050

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