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Magnetic semimetals form an attractive class of materials because of thenon-trivial contributions of itinerant electrons to magnetism. Due to theirrelatively low-carrier-density nature, a doping level of those materials couldbe largely tuned by a gating technique. Here we demonstrate gate-tunableferromagnetism in an emergent van der Waals magnetic semimetal Cr3Te4 based onan ion-gating technique. Upon doping electrons into the system, the Curietemperature (TC) sharply increases, approaching near to room temperature, thendecreases to some extent. Interestingly, this non-monotonous variation of TCaccompanies the switching of the magnetic anisotropy. Furthermore, suchevolutions of TC and anisotropy occur synchronously with the sigh changes ofthe ordinary and anomalous Hall effects. Those results clearly elucidate thatthe magnetism in Cr3Te4 should be governed by its semimetallic band nature,where the band crossing points play a crucial role both for themagneto-transport properties and magnetism itself.

Gate-tunable ferromagnetism in a van der Waals magnetic semimetal