Anisotropic Magnetic Entropy Change and Magnetic Critical Behavior in Van Der Waals Fe3gate2

Abstract

Fe3GaTe2,with intrinsic magnetism at ambient temperature and high perpendicular magnetic anisotropy,is a promising van der Waals material for 2D-materials-based spintronic devices.Herein,we report the anisotropic magnetocaloric effects and magnetic critical phenomena in Fe3GaTe2 single crystal.Owing to the large anisotropy, magnetic entropy change  shows anisotropic character with  of 1.67 J kg−1 K−1 along the c axis and 1.11 J kg−1 K−1 in the ab plane under field change of 5 T.The rotating  from the ab plane to the c axis reaches 0.67 J kg−1 K−1 at magnetic field of 5 T.By fitting the  and relative cooling power (RCP), we determine their relationships to be  (n = 0.694(1)) and  (m = 1.301(3)) for the magnetic field along the c-axis.Further analysis of critical behavior near TC reveals critical exponentsβ = 0.41(1)atTC =341.5(1) K,γ =1.01(1)atTC =341.6(3) K, and δ =3.67(15) atTC = 340 K,indicating a three-dimensional complex magnetic exchange.

Keywords: van der Waals crystal, anisotropic, magnetocaloric effects, critical behavior