  We investigate the tunnelling between an electronic gas with two different
velocities $V_\uparrow \neq V_\downarrow$ and a regular metal. We find that at
the interface between the two systems that the tunnelling conductance for spin
up and spin down are different. As a result a partly polarized gas (``magnetic
wire'') is obtained. This result is caused by the e-e interaction, $g_2'' -
g_1'' \neq 0$, which in the presence of $V_\uparrow \neq V_\downarrow$ gives
rise to two different tunnelling exponents.
