Abstract
The paper reveals the mechanisms of interaction between the spin current in a conductor with strong spin–orbit coupling (Pt) and the spin wave in ferromagnetic media (YIG) with periodic thickness modulation under conditions of Bragg resonances and interlayer coupling. It is shown that in the structure the conditions for the formation of four Bragg resonances in the first Brillouin zone are satisfied. The effect of the spin current on spin waves with frequencies lying in the band gap region is much greater than the effect on spin waves at frequencies lying outside the band gaps. In particular, the spin current makes it possible to implement the frequency tuning of band gaps, changing the width and depth, as well as the number of band gaps. Moreover, the effect of the spin current on each of the band gaps is different. This feature allows us to talk about the frequency-selective control of band gaps in the spectrum of spin waves using the spin current.
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