The magnetic ordering in insulating two-dimensional (2D) van der Waals materials opens new possibilities for magnetoelectronic devices based on 2D systems. Yet, their instability in air and non-trivial device fabrication hindered the development of controllable information transport purely by spin waves -magnons- so far, allowing only the study of spin caloritronic effects driven by thermal gradients [1,2].  For the first time, we demonstrate direct magnon spin transport in air-stable insulating layered antiferromagnet Chromium thiophosphate (CrPS₄). We experimentally show magnon excitation and detection in the linear response and transport through exfoliated CrPS₄ flakes over distances up to 1 µm below the Neel temperature of CrPS4 (T_N = 38 Kelvin) and address the transport by the different magnon modes [3]. These results pave a way for the study of low dimensional antiferromagnetic spin waves and are an important step in the creation of magnonics devices for controllable spin information transport.

 

[1] T. Liu, et al., Physical Review B, 20, 205407 (2020)

[2] W. Xing et al. Physical Review X, 9.1, 011026 (2019)

[3] D.K. de Wal et al. Submitted to Physical Review Letters