Anisotropic magnetocaloric effect in Fe3-xGeTe2

We present a comprehensive study on anisotropic magnetocaloric porperties of the van derWaals weak-itinerant ferromagnet Fe3-xGeTe2 that features gate-tunable room-temperature ferromagnetism in few-layer device. Intrinsic magnetocrystalline anisotropy is observed to be temperature-dependent and most likely favors the long-range magnetic order in thin Fe3-xGeTe2 crsytal. The magnetic entropy change Delta S-M also reveals an anisotropic characteristic between H//ab and H//c, which could be well scaled into a 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 of 0.66 K are deduced from heat capacity with out-of-plane field change of 5 T. By fitting of the field-dependent parameters of -Delta S-M(max) and the relative cooling power RCP, it gives -Delta S-M(max) proportional to H-n with n= 0.603(6) and RCP proportional to H-m with m= 1.20(1) when H//c. Given the high and tunable T-cl Fe3-xGeTe2 crystals are of interest for fabricating the heterostructure-based spintronics device.