Speaker
Description
Spin-wave-based computing has attracted growing interest as a promising approach
to overcome fundamental limitations of CMOS technologies, offering low-power
operation and inherent wave-based logic functionality. Efficient routing of spin
waves through geometrically complex waveguide structures represents a key challenge
in realizing integrated magnonic circuits.
Ga:YIG has been shown to be a highly suitable material for nanoscale magnonic
waveguides (Voronov et al., arXiv:2509.05050, 2025): its strongly reduced
saturation magnetization increases the exchange length substantially, pushing
propagation into the exchange-dominated regime. This leads to largely isotropic
dispersion and noticeably higher group velocities than in non-substituted YIG,
making Ga:YIG a natural candidate for spin-wave transport around bends, where conventional in-plane magnetized, dipolar-dominated YIG suffers from strong anisotropy between the Damon-Eshbach (DE) and backward-volume (BV) configurations. Whether
such exchange-dominated spin waves can be efficiently transported through
geometrically complex structures, involving multiple consecutive bends,
remains an open question.
Here, we investigate spin-wave propagation through S-shaped Ga:YIG nanowaveguides
consisting of two consecutive 90$^{\circ}$ bends, where the fixed
in-plane external magnetic field combined with the geometry enforces a reorientation of the
spin-wave propagation direction relative to the magnetization. $\mu$BLS
measurements reveal spin-wave transmission through both bends in a frequency
range of 8.0--8.4\,GHz, with complementary micromagnetic simulations using the
finite-element solver Magnum.pi showing qualitative agreement with the measured
intensity profiles. Our results suggest that S-shaped Ga:YIG nanowaveguides are
promising candidates for spin-wave routing elements in future magnonic networks.