Several  mechanisms have been proposed by which the observed
galactic and
extra-galactic magnetic fields could have evolved from magnetic seed
fields
created in the early universe. We will present results of calculations
of magnetic fields arising in bubble collisions during the electroweak phase
transition,
derived directly from the electroweak equations of motion and with the
charged W-boson fields acting as the current. We find magnetic fields
of larger magnitude than in previous studies, and discuss possibilities
for these magnetic fields being likely candidates for magnetic seed
fields.