Field-dependent anisotropic room-temperature ferromagnetism in Cr3Te4

Materials hosting intrinsic room-temperature ferromagnetism have significant application in spintronics. In this context, the transition metal sulfide chromium telluride (CrxTey) has sparked significant attention due to its room-temperature ferromagnetism, as well as high magnetic anisotropy, easy tunability, and air stability. This study carefully examines the magnetic characteristics of an intrinsic room-temperature ferromagnetic Cr3Te4 single crystal. Magnetization measurements identify a paramagnetic-to-ferromagnetic (PM-FM) phase transition at TC <^>322 K and high magnetic anisotropy. Meanwhile, a coexistence of ferromagnetism and antiferromagnetism is unveiled below TN <^>90 K. A systematic investigation of magnetization isotherms collected near TC provides the asymptotic critical exponents /3 = 0.365(5), gamma = 1.212(9), 8 = 4.580(4) for H//ab, and /3 = 0.370(3), gamma = 1.329(1), 8 = 4.554(9) for H//c. The obtained critical exponents for H//ab and H//c suggest strong anisotropic and multiple magnetic interactions in Cr3Te4. The comprehensive H -T phase diagrams for H//ab and H//c are constructed using universal scaling and detailed magnetization, revealing strong field-dependent anisotropic room-temperature ferromagnetism and coexistence of ferromagnetism, antiferromagnetism, and noncollinear ferromagnetism. The multiple phases demonstrate that the magnetic couplings in Cr3Te4 are mediated by intralayer super exchange, interlayer double exchange, and direct exchange.