Nonlinear spin-Wave Doppler effect for flexible tuning of magnonic frequencies

Abstract

We theoretically propose a nonlinear spin-wave Doppler effect, in which the time-dependent motion of a magnetic energy boundary acts as an active frequency modulator, directly converting boundary-induced phase dynamics into instantaneous spectral synthesis for propagating spin-wave modes. In contrast to the conventional linear Doppler effect governed by constant relative velocity, this mechanism enables dynamic phase-to-frequency transduction, generating high-order harmonics, magnonic frequency combs, and coherent chirped sidebands, without requiring nonlinear magnon-magnon coupling or multi-magnon scattering. Micromagnetic simulations on voltage-controlled anisotropy boundaries in ferroelectric/ferromagnetic (FE/FM) heterostructures demonstrate that the comb spacing and spectral topology are determined solely by boundary kinematics, confirming direct Doppler phase coupling between boundary motion and spin-wave propagation. These results establish moving magnetic-energy boundaries as a new class of on-chip spectral synthesizers and define a coherent and energy-efficient framework for flexible tuning of magnonic frequencies, fundamentally distinct from traditional passive scattering or nonlinear multi-magnon mechanisms.

19pages, 4 figures

References in corpus (16)

• Quantum magnonics: when magnon spintronics meets quantum information science
• Roadmap on Spin-Wave Computing
• Electric-field control of spin waves at room temperature in multiferroic BiFeO3
• Magnonic frequency comb through nonlinear magnon-skyrmion scattering
• Coherent Terahertz Spin-Wave Emission Associated with Ferrimagnetic Domain Wall Dynamics
• Twisted Magnon Frequency Comb and Penrose Superradiance
• True amplification of spin waves in magnonic nano-waveguides
• Doppler velocimetry of spin propagation in a two-dimensional electron gas
• Excitation and Detection of THz Coherent Spin Waves in Antiferromagnetic $\alpha -\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3$
• Resonant generation of propagating second-harmonic spin waves in nano-waveguides
• Handedness-filter and Doppler shift of spin waves in ferrimagnetic domain walls
• Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators
• Controllable magnon frequency comb in synthetic ferrimagnets
• Local non-linear excitation of sub-100 nm bulk-type spin waves by edge-localized spin waves in magnetic films
• Dual function spin-wave logic gates based on electric field control magnetic anisotropy boundary
• Microscopic theory for the Doppler velocimetry of spin propagation in semiconductor quantum wells