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We present a comprehensive study on anisotropic magnetocaloric porperties ofthe van der Waals weak-itinerant ferromagnet Fe$_{3-x}$GeTe$_2$ that featuresgate-tunable room-temperature ferromagnetism in few-layer device. Intrinsicmagnetocrystalline anisotropy is observed to be temperature-dependent and mostlikely favors the long-range magnetic order in thin Fe$_{3-x}$GeTe$_2$ crsytal.The magnetic entropy change $-\Delta S_M$ also reveals an anisotropiccharacteristic between $H // ab$ and $H // c$, which could be well scaled intoa universal curve. The peak value $-\Delta S_M^{max}$ of 1.20 J kg$^{-1}$K$^{-1}$ and the corresponding adiabatic temperature change $\Delta T_{ad}$ of0.66 K are deduced from heat capacity with out-of-plane field change of 5 T. Byfitting of the field-dependent parameters of $-\Delta S_M^{max}$ and therelative cooling power RCP, it gives $-\Delta S_M^{max} \propto H^n$ with $n =0.603(6)$ and $RCP \propto H^m$ with $m = 1.20(1)$ when $H // c$. Given thehigh and tunable $T_c$, Fe$_{3-x}$GeTe$_2$ crystals are of interest forfabricating the heterostructure-based spintronics device.

Anisotropic magnetocaloric effect in Fe$_{3-x}$GeTe$_2$