  The distribution of bipartite entanglement in a mixed spin-(1/2,1) Heisenberg
tetramer composed from two spin-1/2 and two spin-1 entities is investigated in
detail in presence of an external magnetic field. Four different negativities
measuring a strength of bipartite entanglement are analyzed at zero and
non-zero temperatures. Derived rigorous analytic results and respective
numerical results are discussed with the particular emphasis laid on the
significance of a strength of the pair spin-spin interactions and spin
diversity in the entanglement description. Based on both aforementioned driving
forces the regions of parametric space, where the bipartite entanglement can
exist solely for one type of spin pair or all four spin pairs, were identified.
