The spontaneous generation of uniform magnetic condensate in QED _ { 3 } gives rise to ferromagnetic domain walls at the electroweak phase transition .
These ferromagnetic domain walls are caracterized by vanishing effective surface energy density avoiding , thus , the domain wall problem .
Moreover we find that the domain walls generate a magnetic field B \simeq 10 ^ { 24 } Gauss at the electroweak scale which account for the seed field in the so called dynamo mechanism for the cosmological primordial magnetic field .
We find that the annihilation processes of walls with size R \simeq 10 ^ { 5 } Km could release an energy of order 10 ^ { 52 } erg indicating the invisible ferromagnetic walls as possible compact sources of Gamma Ray Bursts .