  By analyzing Fe-Ni-B compositional diagram we predict an energetically and
dynamically stable FeNiB2 compound. This system belongs to the class of highly
responsive state of material, as it is very sensitive to the external
perturbations. This state is also characterized by a high level of spin
fluctuations which strongly influence possible magnetic long- and short-range
orders. Furthermore, we demonstrate that these antiferromagnetically dominating
fluctuations could lead to the appearance of spin mediated superconductivity.
The obtained results suggest a promising avenue for the search of strong spin
fluctuation systems and related superconductors.
