Conversion of chiral phonons into magnons in ferromagnets and antiferromagnets

Abstract

Chiral phonons with atomic rotations converted into electron spins result in a change of spin magnetizations in crystals. In this paper, we investigate a new conversion of chiral phonons into magnons both in ferromagnets and antiferromagnets by spin models with exchange and Dzyaloshinskii-Moriya interactions. The atomic rotations in chiral phonons are treated as slow phonons, which modulate spin-spin interaction and induce time-dependent magnon excitations due to geometric effect within adiabatic approximation. We demonstrate that a non-trivial change of the number of magnons requires breaking of the spin-rotation symmetry around the spin quantization axis. As a result, the clockwise and counterclockwise chiral phonons induce a change of the magnon number with opposite signs, which corresponds to an increasing or decreasing spin magnetizaton due to the chiral nature of the atomic rotations. In particular, in antiferromagnets, the modulation of magnons due to chiral phonons generates a non-zero net magnetization by the proposed effect, which is expect to be observed in experiments.

13 pages, 5 figures

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Cited by in corpus (10)

• Orbital Pumping Incorporating Both Orbital Angular Momentum and Position
• Electric field-induced nonreciprocal spin current due to chiral phonons in chiral-structure superconductors
• Theory of spin magnetization driven by chiral phonons
• Phonon Edelstein effect in chiral metals
• Chiral magnon-polaron edge states in Heisenberg-Kitaev magnets
• Spin-spin interaction mediated by chiral phonons
• Einstein-de Haas effect: a bridge linking mechanics, magnetism, and topology
• Chiral magnon in ferromagnetic chiral crystals
• Anomalous phonon magnetic moments
• Dynamical Orbital Angular Momentum Induced by Circularly Polarized Phonons