Probing the Dzyaloshinskii-Moriya interaction via the propagation of spin waves in ferromagnetic thin films

Abstract

The Dzyaloshinskii-Moriya interaction (DMI) has attracted considerable recent attention owing to the intriguing physics behind and the fundamental role it played in stabilizing magnetic solitons, such as magnetic skyrmions and chiral domain walls. A number of experimental efforts have been devoted to probe the DMI, among which the most popular method is the Brillouin light scattering spectroscopy (BLS) to measure the frequency difference of spin waves with opposite wave vectors $\pm \mathbf{k}$ perpendicular to the in-plane magnetization $\mathbf{m}$. Such a technique, however, is not applicable for the cases of $\mathbf{k}\parallel \mathbf{m}$, since the spin-wave reciprocity is recovered then. For a narrow magnetic strip, it is also difficult to measure the DMI strength using BLS because of the spatial resolution limit of lights. To fill these gaps, we propose to probe the DMI via the propagation of spin waves in ferromagnetic films. We show that the DMI can cause the non-collinearity of the group velocities of spin waves with $\pm \mathbf{k}\parallel \mathbf{m}$. In heterogeneous magnetic thin films with different DMIs, negative refractions of spin waves emerge at the interface under proper conditions. These findings enable us to quantify the DMI strength by measuring the angle between the two spin-wave beams with $\pm \mathbf{k}\parallel \mathbf{m}$ in homogeneous film and by measuring the incident and negative refraction angles in heterogeneous films. For a narrow magnetic strip, we propose a nonlocal scheme to determine the DMI strength via nonlinear three-magnon processes. We implement theoretical calculations and micromagnetic simulations to verify our ideas. The results presented here are helpful for future measurement of the DMI and for designing novel spin-wave spintronic devices.

arXiv comment10 pages,6 figures,accepted by Physical Review Applied

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Cited by in corpus (10)

• Topological insulators and semimetals in classical magnetic systems
• Goos-Hänchen effect of spin waves at heterochiral interfaces
• Spin-wave focusing induced skyrmion generation
• High Frequency Domain Wall Oscillations in Ferromagnetic Nanowire with a Nanoscale Dzyaloshinskii Moriya Interaction (DMI) Region
• Effect of Dzyaloshinskii-Moriya interaction on magnetic vortex switching driven by radial spin waves
• Off-axial focusing of spin-wave lens in the presence of Dzyaloshinskii-Moriya interaction
• Determination of the Dzyaloshinskii-Moriya interactions
• Tailoring High-Frequency Magnonics in Monolayer Chromium Trihalides
• All-magnonic Stern-Gerlach effect in antiferromagnets
• Giant mode splitting of azimuthal spin waves in radial vortices