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Magnons can generate a spin current, and the standard generating mechanismrequires at least one external field. Since this mechanism is often applied toa multilayer system including a magnet and a paramagnetic metal, the system canpossess not only the charge current induced by the spin current but also thecharge current induced by the external field. The latter is an unnecessaryaccompaniment. Here we show that the tunneling of a magnon pair between chiralmagnets can generate a spin current even without external fields. Thisphenomenon originates from a phase difference between magnon pairs of separate,weakly coupled chiral magnets, and is essentially different from the mechanismusing the angle degree of freedom of the magnon Bose-Einstein condensates. Thepair's tunneling is possible in chiral magnets due to lack of theGoldstone-type gapless excitations. This phenomenon opens the door tospintronics not requiring any external field and using the magnon pairtunneling.

Tunneling between chiral magnets: Spin current generation without external fields