Superconductivity-Enabled Conversion of Ferromagnetic Resonance into Standing Spin Waves
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866910177866809344 |
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| author | Turkin, Ya. V. Pugach, N. G. Maksimov, F. M. Pakhomov, A. S. Chernov, A. I. Belotelov, V. I. Polulyakh, S. N. Stolyarov, V. S. |
| author_facet | Turkin, Ya. V. Pugach, N. G. Maksimov, F. M. Pakhomov, A. S. Chernov, A. I. Belotelov, V. I. Polulyakh, S. N. Stolyarov, V. S. |
| contents | Superconductors can transport spin without Joule dissipation, yet their coherent coupling to short-wavelength magnons in insulating magnets remains largely unexplored. Here we demonstrate experimentally and theoretically that a conventional diffusive superconductor can enable the conversion of the uniform ferromagnetic-resonance (FMR) mode into perpendicular standing spin waves (PSSWs) in an adjacent ferrimagnetic insulator. In Bi-substituted iron-garnet/Nb bilayers, the microwave transmission develops an additional resonance feature that appears only below the Nb transition temperature and lies close to the uniform FMR peak. A microscopic theory that self-consistently couples the quasiclassical Keldysh--Usadel description of the superconducting condensate to the Landau--Lifshitz--Gilbert dynamics shows that the conversion requires two ingredients: (i) an interfacial spin-transfer torque mediated by spin-polarized triplet Cooper pairs and (ii) a depth-dependent effective field produced by Abrikosov vortices (electromagnetic proximity). The resulting susceptibility reproduces the measured lineshapes and establishes superconductivity as an active control knob for exchange standing-wave modes in magnetic insulators. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_27076 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Superconductivity-Enabled Conversion of Ferromagnetic Resonance into Standing Spin Waves Turkin, Ya. V. Pugach, N. G. Maksimov, F. M. Pakhomov, A. S. Chernov, A. I. Belotelov, V. I. Polulyakh, S. N. Stolyarov, V. S. Superconductivity Superconductors can transport spin without Joule dissipation, yet their coherent coupling to short-wavelength magnons in insulating magnets remains largely unexplored. Here we demonstrate experimentally and theoretically that a conventional diffusive superconductor can enable the conversion of the uniform ferromagnetic-resonance (FMR) mode into perpendicular standing spin waves (PSSWs) in an adjacent ferrimagnetic insulator. In Bi-substituted iron-garnet/Nb bilayers, the microwave transmission develops an additional resonance feature that appears only below the Nb transition temperature and lies close to the uniform FMR peak. A microscopic theory that self-consistently couples the quasiclassical Keldysh--Usadel description of the superconducting condensate to the Landau--Lifshitz--Gilbert dynamics shows that the conversion requires two ingredients: (i) an interfacial spin-transfer torque mediated by spin-polarized triplet Cooper pairs and (ii) a depth-dependent effective field produced by Abrikosov vortices (electromagnetic proximity). The resulting susceptibility reproduces the measured lineshapes and establishes superconductivity as an active control knob for exchange standing-wave modes in magnetic insulators. |
| title | Superconductivity-Enabled Conversion of Ferromagnetic Resonance into Standing Spin Waves |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2604.27076 |