Tailoring the Anomalous Hall Effect in van der Waals Ferromagnet Fe3GeTe2
[Purposes]The intrinsic magnetic moments of magnetic materials can lead to anoma-lous Hall effects,and the Hall resistance can be significantly reduced,thus improving the heat loss in micro-and nanoelectronic devices.Two-dimensional van der Waals magnetic materials have shown fascinating natural ferromagnetic properties at the atomic level,which has great potential in the fields of low power spintronics,quantum computing,and optical communication.[Methods]Herein,the fer-romagnetism and magnetic anisotropy of bulk Fe3GeTe2(FGT)were investigated.In addition,the anomalous Hall effect of FGT nanoflakes was studied at various temperatures and thicknesses by stan-dard Hall bar device in detail.[Findings]The results indicate that a pronounced vertical magnetic an-isotropy exists below the Curie temperature(Tc=165 K)of FGT.There is an anomalous Hall resis-tance of 0.764 Ω at 20 K at zero magnetic field,and it decreases to 0.332 Ω at 140 K,which proves that FGT has an anomalous Hall effect regulated with temperature.The hysteresis loop gradually changes from nearly rectangular shape to flat diamond shape,indicating that the magnetization direc-tion of FGT has changed from out-of-plane to in-plane,which further verifies that FGT has intrinsic out-of-plane magnetic anisotropy.Furthermore,the carrier concentration(2.5×1022 cm-3 at 20 K)and mobility(13.3 cm2/(V·s)at 20 K)under large magnetic field(-6 T～6 T)are calculated.
van der Waals ferromagnetsFe3GeTe2magnetic anisotropyanomalous Hall effectmagnetic hysteresis loop
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