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Finding tunable van der Waals (vdW) ferromagnets that operate at above roomtemperature is an important research focus in physics and materials science.Most vdW magnets are only intrinsically magnetic far below room temperature andmagnetism with square-shaped hysteresis at room-temperature has yet to beobserved. Here, we report magnetism in a quasi-2D magnet Cr1.2Te2 observed atroom temperature (290 K). This magnetism was tuned via a protonic gate with anelectron doping concentration up to 3.8 * 10^21 cm^-3. We observednon-monotonic evolutions in both coercivity and anomalous Hall resistivity.Under increased electron doping, the coercivities and anomalous Hall effects(AHEs) vanished, indicating a doping-induced magnetic phase transition. Thisoccurred up to room temperature. DFT calculations showed the formation of anantiferromagnetic (AFM) phase caused by the intercalation of protons whichinduced significant electron doping in the Cr1.2Te2. The tunability of themagnetic properties and phase in room temperature magnetic vdW Cr1.2Te2 is asignificant step towards practical spintronic devices.

Room temperature magnetic phase transition in an electrically-tuned van der Waals ferromagnet