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We report the study of spontaneous magnetization (i.e., spin-polarization)for time-reversal symmetry (TRS)-breaking superconductors with unitary pairingpotentials, in the absence of external magnetic fields or Zeeman fields.Spin-singlet ($\Delta_s$) and spin-triplet ($\Delta_t$) pairings can coexist insuperconductors whose crystal structure lacks inversion symmetry. The TRS canbe spontaneously broken once a relative phase of $\pm\pi/2$ is developed,forming a TRS-breaking unitary pairing state ($\Delta_s\pm i\Delta_t$). Wedemonstrate that such unitary pairing could give rise to spontaneousspin-polarization with the help of spin-orbit coupling. Our result provides analternative explanation to the TRS breaking, beyond the current understandingof such phenomena in the noncentrosymmetric superconductors. The experimentalresults of Zr$_3$Ir and CaPtAs are also discussed in the view of our theory.

Spontaneous magnetization in unitary superconductors with time reversal symmetry breaking