  A general analysis of Meissner effect and spin susceptibility of a uniform
superconductor in an asymmetric two-component fermion system is presented in
nonrelativistic field theory approach. We found that, the pairing mechanism
dominates the magnetization property of superconductivity, and the asymmetry
enhances the paramagnetism of the system. At the turning point from BCS to
breached pairing superconductivity, the Meissner mass squared and spin
susceptibility are divergent at zero temperature. In the breached pairing state
induced by chemical potential difference and mass difference between the two
kinds of fermions, the system goes from paramagnetism to diamagnetism, when the
mass ratio of the two species increases.
