Chiral excitation of spin waves in ferromagnetic films

Abstract

We theoretically investigate the interlayer dipolar and exchange couplings for an array of metallic magnetic nanowires grown on top of an extended ultrathin yttrium iron garnet film. The calculated interlayer dipolar coupling agrees with observed anticrossings [Chen \emph{et al.}, Phys. Rev. Lett. \textbf{120}, 217202 (2018)], concluding that the interlayer exchange coupling is suppressed by a spacer layer between the nanowires and film. The Kittel mode in the nanowire array couples chirally to spin waves in the film, even though Damon-Eshbach surface modes do not exist. The chirality is suppressed when the interlayer exchange coupling becomes strong.

13 pages, 5 figures

References in corpus (7)

• Chiral nanophotonic waveguide interface based on spin-orbit coupling of light
• Measurements of the exchange stiffness of YIG films by microwave resonance techniques
• Phase reciprocity of spin-wave excitation by a microstrip antenna
• Magnetization oscillations and waves driven by pure spin currents
• Giant nonreciprocal emission of spin waves in Ta/Py bilayers
• Spin Waves in Ferromagnetic Insulators Coupled via a Normal Metal
• Spin diffusion in ultracold spin-orbit coupled ${}^{40}$K gas

Cited by in corpus (15)

• Cavity Magnonics
• Chiral spin-wave velocities induced by all-garnet interfacial Dzyaloshinskii-Moriya interaction in ultrathin yttrium iron garnet films
• Resources of nonlinear cavity magnonics for quantum information
• Chirality as Generalized Spin-Orbit Interaction in Spintronics
• Perspective: non-Hermitian physics in magnetic systems
• Observation and control of hybrid spin-wave-Meissner-current transport modes
• Efficient Gating of Magnons by Proximity Superconductors
• Tunable Magnonic Chern Bands and Chiral Spin Currents in Magnetic Multilayers
• Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators
• Local non-linear excitation of sub-100 nm bulk-type spin waves by edge-localized spin waves in magnetic films
• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• Wideband wide-field imaging of spin-wave propagation using diamond quantum sensors
• Nonreciprocal Spin Waves Driven by Left-Hand Microwaves
• Quantitative imaging of nonlinear spin-wave propagation using diamond quantum sensors
• Resonant subwavelength control of the phase of spin waves reflected from a ferromagnetic film edge