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In this work we present a comprehensive investigation on magnetic andthermodynamic properties of the two-dimensional layered honeycomb systemCr$_2$Ge$_2$Te$_6$. Using magnetization and specific heat measurements undermagnetic field applied along two crystallographic directions we obtain themagnetic phase diagram for both directions. Cr$_2$Ge$_2$Te$_6$ is a ferromagnetwith a Curie temperature $T_C=65$ K and exhibits an easy magnetization axisperpendicular to the structural layers in the $ab$-plane. Under magnetic fieldsapplied parallel to the hard plane $ab$ below the magnetic saturation, adownturn with an onset temperature $T\textrm{*}$ is observed in the temperaturedependent magnetization curve. $T\textrm{*}$ shows a monotonous shift towardslower temperatures with increasing field. The nature of this anisotropic andspecific behavior for fields in the hard plane is discussed as an interplayamong field, temperature and effective magnetic anisotropy. Similarities tostructurally related compounds such as CrX$_3$ (X = Br, I) hint towards auniversality of this behavior in ferromagnetic quasi two-dimensional honeycombmaterials.

Magnetic Anisotropy and Low Field Magnetic Phase Diagram of Quasi Two-Dimensional Ferromagnet Cr$_2$Ge$_2$Te$_6$