Poster De Conférence Année : 2025

Spin Wave Circulation in Unbounded Ferromagnetic Films

Circulation d'onde de spin dans des films ferromagnétique étendus

Résumé

A key challenge in spin-wave computing is steering spin waves through circuits without wave distortion or reflections [1–3] This often results in 1D propagation scenarios, which hinder applicability in 2D magnonic circuits. We demonstrate a novel approach using a hard-magnetic spherical microparticle to guide spin waves in an unbounded YIG film as sketched in Figure 1(a). The particle’s stray field induces a radially symmetric magnetization landscape, which was confirmed with micromagnetic simulations shown in Figure 1(b). Thus, this radial Magnetic order creates a circular path for the spin waves propagation. We present an experiment conducted on a 55 nm-thin YIG film using RF antennas at 180◦ for which homogeneous order prevents any spin wave transmission. Approching the spherical particle above the antenna results in significant spin-wave transmission spectra consistently with the particle position and its resulting stray field (cf Figure 1(c)). Furthermore, the spin-wave spectra display exctinction features that are reminiscent of multi-path interference spectra, suggesting that the spin-wave loops around itself. In parallel, we conducted micromagnetic simulations using MuMax3 reproducing the experimental conditions at the same scale as shown in Figure 1(d). These simulations confirmed the formation of spin-waves packet circulating several times around the particle. Nevertheless, it also shows an increasing spread due to the magnitude inhomogenities of the particle stray field away from the center. This work demonstrates the possibility to steer spin-wave onto a cricular path using inhomogeneous magnetic landscape, showcasing the potential for two-dimensional magnonic devices like magnon circulators, advancing scalable spin-wave-based information processing technologies.

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Dates et versions

hal-05132808 , version 1 (27-06-2025)

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Identifiants

  • HAL Id : hal-05132808 , version 1

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Vincent Vlaminck, Jan Klima, Loic Temdie, Daniel Stoeffler, Matthieu Bailleul, et al.. Spin Wave Circulation in Unbounded Ferromagnetic Films. Colloque Louis Néel 2025, Jun 2025, Vogüé, Ardèche, France. ⟨hal-05132808⟩
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