Weak localization of magnons in chiral magnets

Abstract

We report on the impact of the Dzyaloshinskii-Moriya interaction on the coherent backscattering of spin waves in a disordered magnetic material. This interaction breaks the inversion symmetry of the spin-wave dispersion relation, such that ${\omega }_{\mathbf{k}}={\omega }_{2{\mathbf{K}}^{\mathrm{I}}-\mathbf{k}}\ne {\omega }_{-\mathbf{k}}$, where ${\mathbf{K}}^{\mathrm{I}}$ is related to the Dzyaloshinskii-Moriya vectors. As a result of numerical investigations we find that the backscattering peak of a wave packet with initial wave vector ${\mathbf{k}}_0$ shifts from $-{\mathbf{k}}_0$ to $2{\mathbf{K}}^{\mathrm{I}}-{\mathbf{k}}_0$, such that the backscattering wave vector and the initial wave vector are in general no longer antiparallel. The shifted coherence condition is explained by a diagrammatic approach and opens up an avenue to measure sign and magnitude of the Dzyaloshinskii-Moriya interaction in weakly disordered chiral magnets.

5 pages, 2 figures

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• Spin Seebeck insulator
• Interface-Induced Phenomena in Magnetism
• Topological Magnon Insulator in Insulating Ferromagnet
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• Momentum isotropisation in random potentials

Cited by in corpus (4)

• Green's function formalism for spin transport in metal-insulator-metal heterostructures
• Inplane anisotropy of longitudinal thermal conductivities and weak localization of magnons in a disordered spiral magnet
• Scattering theory of transport through disordered magnets
• Spin-wave localization on phasonic defects in one-dimensional magnonic quasicrystal