Room temperature magnetic phase transition in an electrically-tuned van der Waals ferromagnet
arxiv(2023)
摘要
Finding tunable van der Waals (vdW) ferromagnets that operate at above room
temperature is an important research focus in physics and materials science.
Most vdW magnets are only intrinsically magnetic far below room temperature and
magnetism with square-shaped hysteresis at room-temperature has yet to be
observed. Here, we report magnetism in a quasi-2D magnet Cr1.2Te2 observed at
room temperature (290 K). This magnetism was tuned via a protonic gate with an
electron doping concentration up to 3.8 * 10^21 cm^-3. We observed
non-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. This
occurred up to room temperature. DFT calculations showed the formation of an
antiferromagnetic (AFM) phase caused by the intercalation of protons which
induced significant electron doping in the Cr1.2Te2. The tunability of the
magnetic properties and phase in room temperature magnetic vdW Cr1.2Te2 is a
significant step towards practical spintronic devices.
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