We demonstrate the potential of van der Waals magnets for spintronic applications by reporting long-distance magnon spin transport in the electrically insulating antiferromagnet chromium thiophosphate ($\mathrm{Cr}\mathrm{P}{\mathrm{S}}_4$) with perpendicular magnetic anisotropy. We inject and detect magnon spins nonlocally by Pt contacts and monitor the nonlocal resistance as a function of an in-plane magnetic field up to 7 T. We observe a nonlocal resistance over distances up to at least a micron below the Néel temperature ($T_{\mathrm{N}}=38$ K) close to magnetic field strengths that saturate the sublattice magnetizations.

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• Magnetism
• Magnetotransport
• Spin waves
• Spintronics
• 2-dimensional systems