Electrical excitation of superfluid- and string-like domain wall modes in layered van der Waal antiferromagnets

Efficient excitation of magnons (collective spin excitation in magnetically ordered materials) has been a limiting factor in designing low-dissipation magnonic devices. The recent emergence of low-dimensional van der Waal magnets [such as CrI3] with demonstrated electrical control of magnetic order [Nature Mat. 17, 406 (2018)] opens up new opportunities in the field of magnonics. Motivated by these developments, we theoretically demonstrate the electrical excitation of superfluid- and string-like modes harbored by the antiferromagnetically coupled domain walls of bilayer CrI3. Furthermore, we show that dc magnetic fields provide a handle for selectively exciting the mode of choice.