Communication Dans Un Congrès Année : 2025

Shaping non-reciprocal caustic beams

Résumé

Spin waves constitute the building blocks of novel wave computing methods such as spectral analysis [1], and neuromorphic computing [2], which are all interference-based techniques. Recently, basics concepts of optics applied to spin waves demonstrated the possibility to shape and steer spin wave beams, suggesting prominent performance in particular tasks such as image processing and speech recognition [3]. However, The complexity of spin dynamics, inherently due to its dependence to numerous parameters, and the intricacy of magnon-magnon interactions, requires heavy computational methods, which can limit the scope of study. In this context, we developed an efficient tool to study the near-field diffraction (NFD) patterns of spin wave in homogeneous out-of-plane magnetized thin films for arbitrary distribution of excitation fields [4, 5]. Here, we present the adaptation of our NFD model to in-plane magnetized thin films, and reveal how caustic spin-wave beams can be directly emitted from a sharply constricted stripline. We show in particular the importance of not only meeting the suitable caustic conditions of field and frequency, but also having of a seemingly punctual source for shaping the caustic beam [6]. Using spatially resolved micro-focused Brillouin light spectroscopy on various constriction sizes, we satisfyingly verify our predictions (see Fig. 1), and explore further the steerability as well as the caustic beams properties (see Fig. 2). These findings have important implications for future development of magnonic devices such as spin wave splitters, passive spin-wave frequencydivision demultiplexers, and wave-based computing building blocks for neuromorphic architecture. This work was supported by the French ANR projects “MagFunc”, and ANR-22-EXSP-0004 “SWING”, the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering under Award DE-SC0020308, and the Transatlantic Research Partnership, a program of FACE Foundation and the French Embassy. References: [1] A. Papp, W. Porod, A.J. Csurgay, G. Csaba, “Nanoscale spectrum analyzer based on spin-wave interference”, Scientific Reports 7, 9245, (2017). [2] A. Papp, W. Porod, G. Csaba, “Nanoscale neural network using non-linear spin-wave interference”, Nature Communications 12, 6422, (2021). [3] E. Albisetti, S. Tacchi, R. Silvani, G. Scaramuzzi, et al., “Optically inspired ScholarOne Abstracts - Abstract proof popup https://2025joint.abstractcentral.com/submission?PARAMS=xik_RbL... 1 sur 3 16/07/2024, 17:48 nanomagnonics with nonreciprocal spin waves in synthetic antiferromagnets”, Advanced Materials 32, 1906439, (2020). [4] L. Temdie, V. Castel, M. Jungfleisch, R. Bernard, H. Majjad, D. Stoeffler, Y. Henry, M. Bailleul, and V. Vlaminck. “Probing spin wave diffraction patterns of curved antennas”, Phys. Rev. Appl. 21, 014032 (2024). [5] V. Vlaminck, L. Temdie, V. Castel, M.B. Jungfleisch, D. Stoeffler, Y. Henry, M. Bailleul, “Spin wave diffraction nmodel for perpendicularly magnetized films”, Journal of Applied Physics 133, 053903, (2023). [6] D. Wagle, D. Stoeffler, L. Temdie, M. T. Kaffash, V. Castel, H. Majjad, R. Bernard, Y. Henry, M. Bailleul, M. B. Jungfleisch, and V. Vlaminck, "Shaping non-reciprocal caustic spin-wave beams", arXiv:2404.15011 (2024)

MMM-Intermag2025_CD-08.pdf (18.18 Mo) Télécharger le fichier
ScholarOne Abstracts - Abstract proof_Vlaminck.pdf (1.06 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)
Licence
Origine Fichiers produits par l'(les) auteur(s)
Licence

Dates et versions

hal-04920417 , version 1 (07-02-2025)

Identifiants

  • HAL Id : hal-04920417 , version 1

Citer

Vincent Vlaminck. Shaping non-reciprocal caustic beams. 2025 Joint MMM-Intermag Conference, Jan 2025, New Orleans (LO), United States. ⟨hal-04920417⟩
169 Consultations
142 Téléchargements

Partager

  • More