Controlling Spin-Waves by Inhomogeneous Spin-Transfer Torques
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arXiv
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2025
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| author | Gnoatto, Lorenzo da Silva, Jean F. O. Bassant, Artim L. Menezes, Rai M. Duine, Rembert A. Milossevic, Milorad V. Lavrijsen, Reinoud |
| author_facet | Gnoatto, Lorenzo da Silva, Jean F. O. Bassant, Artim L. Menezes, Rai M. Duine, Rembert A. Milossevic, Milorad V. Lavrijsen, Reinoud |
| contents | We investigate the interplay between spin currents and spin waves in nanofabricated Permalloy waveguides with geometrical constrictions. Using propagating spin-wave spectroscopy, micromagnetic simulations, and analytical modeling, we provide experimental evidence that spin-wave phase can be modulated by inhomogeneous spin-transfer torques generated by current-density gradients shaped by the constriction geometry. Narrower constrictions enhance these gradients and modify the internal field for Damon-Eshbach spin waves, resulting in pronounced changes in spin-wave group velocity and phase. To our knowledge, this constitutes the first demonstration of deterministic phase modulation via engineered nonuniform spin-transfer torques. Beyond enabling a scalable route to magnonic interferometry - a building block for spin-wave-based computing - our findings establish a platform to control spin-wave dynamics in spatially varying current landscapes, relevant for analogue-gravity experiments in condensed matter systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_16612 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Controlling Spin-Waves by Inhomogeneous Spin-Transfer Torques Gnoatto, Lorenzo da Silva, Jean F. O. Bassant, Artim L. Menezes, Rai M. Duine, Rembert A. Milossevic, Milorad V. Lavrijsen, Reinoud Mesoscale and Nanoscale Physics Applied Physics We investigate the interplay between spin currents and spin waves in nanofabricated Permalloy waveguides with geometrical constrictions. Using propagating spin-wave spectroscopy, micromagnetic simulations, and analytical modeling, we provide experimental evidence that spin-wave phase can be modulated by inhomogeneous spin-transfer torques generated by current-density gradients shaped by the constriction geometry. Narrower constrictions enhance these gradients and modify the internal field for Damon-Eshbach spin waves, resulting in pronounced changes in spin-wave group velocity and phase. To our knowledge, this constitutes the first demonstration of deterministic phase modulation via engineered nonuniform spin-transfer torques. Beyond enabling a scalable route to magnonic interferometry - a building block for spin-wave-based computing - our findings establish a platform to control spin-wave dynamics in spatially varying current landscapes, relevant for analogue-gravity experiments in condensed matter systems. |
| title | Controlling Spin-Waves by Inhomogeneous Spin-Transfer Torques |
| topic | Mesoscale and Nanoscale Physics Applied Physics |
| url | https://arxiv.org/abs/2512.16612 |