  In tunnel junctions of which at least one side is a ferromagnet, very large
magnetic polarization change ($\approx 0.1 \mu_B$) and splitting of the spin up
and spin down Fermi energy ($\approx 0.1 eV$) can be created under steady state
finite current conditions (bias voltage $\approx$ 1 volt). This is {\bf much
higher} than can be created by the highest magnetic field on earth. We
illustrate this with a specific calculation of a recently observed very large
Hall effect in the Al side of a Co-I-Al tunnel junction. Other recent
experiments that support this idea are discussed.
