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The low braking index pulsar PSR J1734−3333 could be born with a superhigh internal magnetic field of 10 14 –10 16  G, and undergo a supercritical accretion soon after its formation in a supernova explosion. The buried multipole magnetic fields will merger into a dipole magnetic field. Since the magnetic flow transfers from the core to the crust of the pulsar, its surface dipole field grows quickly at a power‐law form assumed until it saturates at the level of internal dipole field. The increase in surface dipole magnetic field results in the small braking index of  n  = 0.9. Keeping the current field‐growth index  ϵ  = 1.34, this pulsar will become a magnetar with surface dipole magnetic field at the equator  B  d  ∼ 2.6(1) × 10 14  G and ∼5.3(2) × 10 14  G after next 50 kyrs and 100 kys, respectively.

Could the low‐braking‐index pulsar PSR J1734–3333 evolve into a magnetar?