Abstract
Growing observations reveal that soft gamma-ray repeaters and anomalousx-ray pulsars are magnetars. Their magneticfields may achieve 1014−1015 G. We explore the origin of thesuperstrong magnetic field by considering the magnetization of the3P2 superfluid neutrons inside neutron stars (NSs). By solvingthe Tolman–Oppenheimer–Volkov equations together with theequation of state adopted by Elgarøy et al. [Phys. Rev. Lett.77 (1996) 1428] in the calculation of the neutron pairing gap, wespecifically calculate the NS internal structure, the permissible regionfor 3P2 superfluid neutrons inside the NS, and the total magneticmoment contributed by the orderly arranged neutron vortexes. Theresult shows that the induced magnetic field may cover a widerange, which is consistent with the magnetic field predicted bythe standard magnetic dipole radiation for pulsar spindown.
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