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Magnetic van der Waals (vdW) materials have been heavily pursued forfundamental physics as well as for device design. Despite the rapid advances,so far magnetic vdW materials are mainly insulating or semiconducting, and noneof them possesses a high electronic mobility - a property that is rare inlayered vdW materials in general. The realization of a magnetic high-mobilityvdW material would open the possibility for novel magnetic twistronic orspintronic devices. Here we report very high carrier mobility in the layeredvdW antiferromagnet GdTe3. The electron mobility is beyond 60,000 cm2 V-1 s-1,which is the highest among all known layered magnetic materials, to the best ofour knowledge. Among all known vdW materials, the mobility of bulk GdTe3 iscomparable to that of black phosphorus, and is only surpassed by graphite. Bymechanical exfoliation, we further demonstrate that GdTe3 can be exfoliated toultrathin flakes of three monolayers, and that the magnetic order andrelatively high mobility is retained in approximately 20-nm-thin flakes.

High mobility in a van der Waals layered antiferromagnetic metal