Observation of the Magnon Hall Effect

By Y. Onose, T. Ideue, Hosho Katsura, Yuki Shiomi, N. Nagaosa, Y. Tokura. Science, 2010

626 citations recorded by the source corpus.

Observing the Magnon Hall Effect The anomalous thermal Hall effect occurs when transverse heat transport is generated in the absence of an external magnetic field. The transport may be mediated by free carriers, phonons, or spin waves (magnons). Onose et al. (p. 297) observed this effect in an insulating ferromagnet and were able to rule out free carriers and phonons as the mediators of the thermal transport. Instead, the observations are consistent with a theory ascribing its origin to magnon propagation. This thermal magnon Hall effect is caused by the spin-orbit interaction, which acts in a fashion similar to the magnetic field in the conventional Hall effect. Its observation in an insulator may enable the elimination of losses in spintronic applications. Spin excitations in an insulating ferromagnet exhibit an anomalous thermal Hall effect. The Hall effect usually occurs in conductors when the Lorentz force acts on a charge current in the presence of a perpendicular magnetic field. Neutral quasi-particles such as phonons and spins can, however, carry heat current and potentially exhibit the thermal Hall effect without resorting to the Lorentz force. We report experimental evidence for the anomalous thermal Hall effect caused by spin excitations (magnons) in an insulating ferromagnet with a pyrochlore lattice structure. Our theoretical analysis indicates that the propagation of the spin waves is influenced by the Dzyaloshinskii-Moriya spin-orbit interaction, which plays the role of the vector potential, much as in the intrinsic anomalous Hall effect in metallic ferromagnets.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics

View Paper: https://www.semanticscholar.org/paper/5ac4d9ebfadac43137b6e62a0a58f445fce2dbec

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In Atomic and Molecular Physics, and Optics

In Condensed Matter Physics

Citations in the corpus

Symmetry and Topology in Non-Hermitian Physics (2018, background): “In class A with η, Table VIII predicts the topological phase characterized by an integer in two dimensions in the presence of a real gap, which corroborates the magnon Hall effect [24] as a bosonic counterpart of the quantum Hall effect.”
Magnetic texture based magnonics (2020, background): “The effective magnetic field produced by the Skymion can also deflect spin waves impinging on the Skyrmion from the outside, giving rise to the magnon Hall effect [98].”
New perspectives for Rashba spin-orbit coupling. (2015, background): “This linear component in the dispersion relation induces an anomalous velocity leading to the magnon Hall effect [81], orbital moment and edge currents [82], as well as to chiral damping [83].”
Towards Oxide Electronics: a Roadmap (2019, background): “Another indirect measurement method may be provided by the thermal effects associated to the magnetic excitation transport [586,587], but requires further experimental studies.”
Spin Hall Effects in Metals (2013, background): “have recently observed an anomalous thermal Hall effect (Righi-Leduc effect) in Lu V O [200].”
Skyrmions in magnetic multilayers (2017, background): “This is known as the topological Nernst effect in metallic chiral magnets where the carriers are electrons [99], and as the topological magnon Hall effect in insulating chiral magnets where the carriers are magnons [100].”