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Spin waves (SWs) in magnetic nanotubes have shown interesting nonreciprocalproperties in their dispersion relation, group velocity, frequency linewidthand attenuation lengths. The reported chiral effects are similar to thoseinduced by the Dzyaloshinskii-Moriya interaction, but originating from thedipole-dipole interaction. Here we show, that the isotropic-exchangeinteraction can also induce chiral effects in the SW transport; the so-calledBerry phase of SWs. We demonstrate that with the application of magneticfields, the nonreciprocity of the different SW modes can be tuned between thefully dipolar governed and the fully exchange governed cases, as they aredirectly related to the underlaying equilibrium state. In the helical state,due to the combined action of the two effects every single sign combination ofthe azimuthal and axial wave vectors leads to different dispersion, allowingfor a very sophisticated tuning of the SW transport. A disentanglement of thedipole-dipole and exchange contributions so far was not reported for the SWtransport in nanotubes. Furthermore, we propose a device based on coplanarwaveguides that would allow to selectively measure the exchange or dipoleinduced SW nonreciprocities. In the context of magnonic applications, ourresults might encourage further developments in the emerging field of 3Dmagnonic devices using curved magnetic membranes.

Non-reciprocity of spin waves in magnetic nanotubes with helical equilibrium magnetization