  The recent emergence of 2D van der Waals magnets down to atomic layer
thickness provides an exciting platform for exploring quantum magnetism and
spintronics applications. The van der Waals nature stabilizes the long-range
ferromagnetic order as a result of magnetic anisotropy. Furthermore, giant
tunneling magnetoresistance and electrical control of magnetism have been
reported. However, the potential of 2D van der Waals magnets for magnonics,
magnon-based spintronics, has not been explored yet. Here, we report the
experimental observation of long-distance magnon transport in
quasi-twodimensional van der Waals antiferromagnet MnPS3, which demonstrates
the 2D magnets as promising material candidates for magnonics. As the 2D MnPS3
thickness decreases, a shorter magnon diffusion length is observed, which could
be attributed to the surface-impurity-induced magnon scattering. Our results
could pave the way for exploring quantum magnonics phenomena and designing
future magnonics devices based on 2D van der Waals magnets.
