Long-distance propagation of high-velocity antiferromagnetic spin waves

Abstract

We report on coherent propagation of antiferromagnetic (AFM) spin waves over a long distance ($\sim$10 $\mu$m) at room temperature in a canted AFM $\alpha$-Fe${}_2$O${}_3$ with the Dzyaloshinskii-Moriya interaction (DMI). Unprecedented high group velocities (up to 22.5 km/s) are characterized by microwave transmission using all-electrical spin wave spectroscopy. We derive analytically AFM spin-wave dispersion in the presence of the DMI which accounts for our experimental results. The AFM spin waves excited by nanometric coplanar waveguides with large wavevectors enter the exchange regime and follow a quasi-linear dispersion relation. Fitting of experimental data with our theoretical model yields an AFM exchange stiffness length of 1.7 angstrom. Our results provide key insights on AFM spin dynamics and demonstrate high-speed functionality for AFM magnonics.

References in corpus (11)

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• Switching magnon chirality in artificial antiferromagnet
• Efficient Spin-Orbit Torques in an Antiferromagnetic Insulator with Tilted Easy Plane
• Modelling spin waves in noncollinear antiferromagnets: spin-flop states, spin spirals, skyrmions and antiskyrmions
• Antiferromagnetic resonance in $\alpha$-Fe${}_2$O${}_3$ up to its Néel temperature
• Role of substrate clamping on anisotropy and domain structure in the canted antiferromagnet $\alpha$-Fe${}_2$O${}_3$
• Optimizing propagating spin wave spectroscopy

Cited by in corpus (7)

• Antiferromagnetic magnon spintronic based on non-reciprocal and non-degenerated ultra-fast spin-waves in the canted antiferromagnet α-Fe2O3
• Spin wave dispersion of ultra-low damping hematite ($\alpha {\text{-Fe}}_2{\text{O}}_3$) at GHz frequencies
• Controllable magnon frequency comb in synthetic ferrimagnets
• Unveiling Stable One-dimensional Magnetic Solitons in Magnetic Bilayers
• Sub-millimeter propagation of antiferromagnetic magnons via magnon-photon coupling
• Tunable Enhancement of Magnetization Dynamics by Crystal Cut at Interface Exchange Coupled $\alpha$-Fe${}_2$O${}_3$/NiFe Heterostructures
• Ginzburg-Landau theory of spin pumping through an antiferromagnetic layer near the Néel temperature