Researchers from Ohio University managed to measure the transmission of spin information in only a few electrons, using a diamond wire only 4 micrometers long and 200 nanometers wide, chilled to 4 degrees above absolute zero. They discovered that spin transport is efficient in diamond wire.

To measure the spin information, the researchers cooled the wire made of a tiny artificial diamond (doped with nitrogen) stretched out into a thin wire shape, and then turned on a magnetic field and measured the spins of electrons in the wire with a tiny cantilever.