Earlier Enqvist and Olesen have shown that formation of ferromagnetic planar walls in vacuum at GUT scales in comoving plasmas may generate a large scale magnetic field of $B_{ now}\simeq{ 10^{ -14}G}$. In this paper we show that starting from classical Einstein-Cartan-Maxwell strong gravity, a spin-polarised ferromagnetic cylinder gives rise to a cosmological magnetic field of the order $B_{ now}\simeq{ 10^{ -22}G}$. Vorticity of cylinder is used to obtain galactic magnetic fields. Magnetic fields up to $B\sim{ 10^{ 9}G}$ can be obtained from the spin density of the cylinder. If matching conditions are used cosmological magnetic fields of the order of $B\sim{ 10^{ -16}R\frac{ Gauss}{ cm}}$ where $R$ is the radius of the cosmic strings. For a cosmic string with the radius of an hydrogen atom the cosmic magnetic field is $B\sim{ 10^{ -32}Gauss}$ which is enough to seed galactic dynamos.
Categories: gr-qc