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Nonreciprocal Inertial Spin-Wave Dynamics in Twisted Magnetic Nanostrips.

Massimiliano d'Aquino1, Riccardo Hertel2

  • 1University of Naples Federico II, Department of Electrical Engineering and ICT, I-80125 Naples, Italy.

Physical Review Letters
|December 5, 2025
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We developed a theoretical framework for inertial spin-wave dynamics in twisted magnetic nanostrips, generating terahertz magnetic oscillations. This work paves the way for novel curvilinear terahertz magnonics and nonreciprocal spintronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Spin-wave dynamics are crucial for magnonics and spintronics.
  • Understanding the influence of geometry on magnetic phenomena is essential.
  • Inertial effects in magnetic systems are gaining attention for novel functionalities.

Purpose of the Study:

  • To develop a theoretical framework for inertial spin-wave dynamics in 3D twisted soft-magnetic nanostrips.
  • To investigate the generation of terahertz (THz) magnetic oscillations due to coupled curvature, torsion, and magnetic inertia.
  • To explore the nonreciprocal spin-wave spectra arising from geometric chirality and inertial effects.

Main Methods:

  • Theoretical modeling of inertial spin-wave dynamics.
  • Analytical derivation of dispersion relations and spectral linewidths.
  • Investigation of curvature-induced geometric (Berry) phase effects.
  • Analysis of topological variations (Möbius, helical geometries) on wave number quantization.

Main Results:

  • Coupling of curvature, torsion, and magnetic inertia generates THz magnetic oscillations.
  • Pronounced nonreciprocity in spin-wave spectra due to symmetry breaking.
  • Analytical expressions for dispersion relations and linewidths in THz and GHz regimes.
  • Distinct wave number quantization rules for different topological geometries.

Conclusions:

  • Twisted magnetic strips offer a viable platform for curvilinear THz magnonics.
  • Geometric chirality and inertial effects are key to achieving nonreciprocity.
  • Topology plays a significant role in spin-wave transport characteristics.
  • This framework enables the design of novel nonreciprocal spintronic devices.