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We report on the magnetic properties of CsCo$_2$Se$_2$ with ThCr$_2$Si$_2$structure, which we have characterized through a series of magnetization andneutron diffraction measurements. We find that CsCo$_2$Se2$_2$ undergoes aphase transition to an antiferromagnetically ordered state with a N\'eeltemperature of $T_{\rm N} \approx$ 66 K. The nearest neighbour interactions areferromagnetic as observed by the positive Curie-Weiss temperature of $\Theta\approx$ 51.0 K. We find that the magnetic structure of CsCo$_2$Se$_2$ consistsof ferromagnetic sheets, which are stacked antiferromagnetically along thetetragonal \textit{c}-axis, generally referred to as A-type antiferromagneticorder. The observed magnitude of the ordered magnetic moment at $T$ = 1.5 K isfound to be only 0.20(1)$\mu_{\rm Bohr}$/Co. Already in comparably smallmagnetic fields of $\mu_0 H_{MM}$(5K) $\approx$ 0.3 T, we observe ametamagnetic transition that can be attributed to spin-rearrangements ofCsCo$_2$Se$_2$, with the moments fully ferromagnetically saturated in amagnetic field of $\mu_0 H_{\rm FM}$(5K) $\approx$ 6.4 T. We discuss the entireexperimentally deduced magnetic phase diagram for CsCo$_2$Se$_2$ with respectto its unconventionally weak magnetic coupling. Our study characterizesCsCo$_2$Se$_2$, which is chemically and electronically posed closely to the$A_xFe_{2-y}Se_2$ superconductors, as a host of versatile magneticinteractions.

Field-induced transition of the magnetic ground state from A-type antiferromagnetic to ferromagnetic order in CsCo2Se2