  We have investigated the magnetic properties and mapped out the phase diagram
of the honeycomb magnet Na2Co2TeO6 with Co 3d7 in out-of-plane magnetic fields.
This material has previously been proposed to show nearest-neighbor Kitaev
interactions between Co spins and maybe even Kitaev quantum spin liquid
behavior in high fields. At low magnetic fields, we observe a thermal phase
transition at TN = 27 K, transitioning from a paramagnetic state to a canonical
ferrimagnetic state. Under the application of magnetic fields, a spin flop-like
phase transition occurred before saturation of J = 1/2 between 10 K and TN.
Below 10 K, a peak-dip-peak structure emerges between 10 and 17 T in the
magnetic susceptibility (dM/dH) before the magnetic saturation, reminiscent of
magnetic plateau behavior. The measurement of the magnetocaloric effect also
shows dip-peak-dip behavior in this field range. Our data can be explained by
an XXZ model with a single ion anisotropy and possibly small Kitaev and
{\Gamma} exchange interactions. We also unambiguously determined the
magnetization saturation field that helps constrain the energy scale of the
exchange interactions
