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The superconducting and critical current properties of thin films of NiBi3formed on the surface of carbon microfibers and sapphire substrates arereported. The NiBi3 coated carbon microfibers were prepared by reacting 7{\mu}m diameter Ni-coated (~ 80 nm) carbon fibers with Bi vapor, and thin filmson sapphire were formed by exposing electron-beam deposited Ni films (~ 40 -120 nm) to Bi vapor. The microfibers and films show Tc = 4.3 K and 4.4K,respectively, which were slightly higher than that reported for bulkpolycrystalline NiBi3. The critical current density (Jc) was measured below thetransition temperature and is well described by the Ginzburg-Landau power-law.

Superconducting and Critical Current Properties of NiBi3 Thin Films on Carbon Microfibers and Sapphire