Conductance quantization in ferromagnetic Ni nanowire

Abstract Conductance of a ferromagnetic Ni nanowire formed at a break junction between Ni wire and Ni film is clearly quantized in units of 2e2/h in the absence of magnetic fields. The conductance quantization unit, however, switches to e2/h in the presence of magnetic fields higher than the saturation field of the Ni wire. This indicates the conductance quantization in a ferromagnetic nanowire is closely related to magnetic structure of the nanowire.