We perform an ab initio study of the electronic structure and magnetic properties of 3d, 4d and 5d transition metals (TM) adsorbed on freestanding and Ag(1 1 1)-supported [Formula: see text]-borophene. The stability of TM adsorption is high for all atoms and increases with the period. For the 3d TM adsorption we observed strong exchange effects. The Ag(1 1 1)-surface induced small effects on the calculated properties. Studying the magnetic interaction between TMs, VIB atoms showed direct exchange, while VIIB and Fe showed 2p(B)-mediated indirect exchange. In the ultimate case of a one-dimensional TM array, Ru and Os also show direct exchange effects.
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