Ferromagnetic properties allow electric current to flow over the surface of special films but normally only under very low temperatures.
Something of great importance is that this electric current is generated spontaneously and without any kind of external magnetic field – electric current without magnetism.
Using Cr as an atomic sized magnet and Sb and Te to help “glue” their alignment into place, apparently allows this electric current to be not only lossless but at room temperature.
Read more here: https://solarthermalmagazine.com/2015/12/29/63464/
Published paper: http://www.nature.com/ncomms/2015/151119/ncomms9913/full/ncomms9913.html