Electrodeposited Pt1-xMx (M=Ni,Co) alloys were studied for possible use in a magnetic thermometry application. The effects of boric acid and potential on the deposition process and on magnetic properties of the resulting films were examined. Both alloy series showed a monotonic decrease in platinum content as the potential was stepped to progressively more reducing potentials. While films in the Pt1-xNix series were all face centered cubic (fcc), those in the Pt1-xCox series showed a transition from fcc to hexagonal close packed as the films became more cobalt rich. For the Pt1-xNix system, the presence of B(OH)3 during deposition was accompanied by decreased Coulombic efficiency at more reducing deposition potentials, increased oxygen incorporation, and decreased magnetization relative to films deposited in the absence of boric acid.[1] For the Pt1-xCox system, the presence of B(OH)3 also resulted in lower Coulombic efficiency and in lower magnetizations over an intermediary potential range. In contrast to the Pt1-xNix, the decreased Coulombic efficiency for the Pt1-xCox system was also accompanied by a strong suppression of the deposition process. For both series, the Curie temperature decreased with increasing platinum content, allowing the magnetic thermosensitivity to be optimized for a particular temperature range of interest by appropriate selection of the deposition potential.