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Short-range Thermal Magnon Diffusion in Magnetic Garnet

Abstract : Using the spin Seebeck effect (SSE), we study the propagation distance of thermal spin currents inside a magnetic insulator thin film in the short-range regime. We disambiguate spin currents driven by temperature and chemical potential gradients by comparing the SSE signal before and after adding a thermalization capping layer on the same device. We report that the measured spin decay behavior near the heat source is well accounted for by a diffusion model where the magnon diffusion length is in submicron range, \textit{i.e.} two orders of magnitude smaller than previous estimates inferred from the long-range behavior. Our results highlight the caveat in applying a diffusive theory to describe thermal magnon transport, where a single decay length may not capture the behavior on all length scales.
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https://hal.archives-ouvertes.fr/hal-02935127
Contributor : Olivier Klein Connect in order to contact the contributor
Submitted on : Thursday, September 10, 2020 - 9:37:40 AM
Last modification on : Tuesday, January 4, 2022 - 6:38:55 AM

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Kyongmo An, Ryuhei Kohno, Nicolas Thiéry, Derek Reitz, Laurent Vila, et al.. Short-range Thermal Magnon Diffusion in Magnetic Garnet. Physical Review B, American Physical Society, 2021, 103 (17), ⟨10.1103/PhysRevB.103.174432⟩. ⟨hal-02935127⟩

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