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VIDEO DOI: https://doi.org/10.48448/phfx-7408

technical paper

MMM 2022

November 07, 2022

Minneapolis, United States

Tunable Magnonic Chern Bands and Chiral Spin Currents in Magnetic Multilayers

Realization of novel topological phases in magnonic band structures represents a new opportunity for the development of low-dissipation magnonics 1-5. The previous proposals require materials with either special crystal symmetries 2-3 or artificially modulated structures that demand advanced nanofabrication techniques 4-5, both of which bring in difficulties for experimental realization.
In this work, we theoretically study the magnonic band structure of antiparallelly aligned magnetic multilayers (Fig. 1), and reveal their field-tunable topological phases 1. We show that the long-range dipolar interaction between propagating magnons is chiral in nature, whose strength depends on the wave vector direction and therefore breaks time-reversal symmetry. Consequently, the dipolar interaction plays a role like spin-orbit coupling in electronic systems and generates bulk bands with non-zero Chern integers and ultra-localized magnonic surface states that carry chiral spin currents (Fig. 1). Through an external magnetic field, the topological phases can be switched, which therefore provides a tunable for transferring spin angular momenta in this synthetic antiparallelly aligned heterostructure. Besides analytical study, we also carry out micromagnetic simulations on the simplest multilayer system – YIG/Py bilayers using MuMax3 6. The magnonic band structure with a degeneration point only in one half of the reciprocal space and the unidirectional propagation of spin waves (Fig. 2) both validate our analytical results.
Our study provides an easy-to-implement system for realizing topologically protected magnonic surface states and low-dissipation spin transport in a tunable manner, which is expected to benefit various areas of modern spintronics and magnonics.


Transcript English (automatic)

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