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We study the electromagnetic radiation from a newborn magnetar whose magnetic tilt angle decreases rapidly and its effect on light curve of gamma-ray bursts (GRBs). We calculate the evolution of the angular spin frequency, the perpendicular component of the surface magnetic field strength, and the energy loss rate through magnetic dipole radiation. We show that the spin-down of the magnetar experiences two stages characterized by two different timescales. The apparent magnetic field decreases rapidly with the decrease of the tilt angle. It is shown that the evolution of the energy loss rate is consistent with the overall light curves of those gamma-ray bursts which show a plateau structure in the afterglow stage, such as GRB 061121 and GRB 090426 etc. The energy loss rate of the magnetar with rapid evolution of magnetic tilt angle is very different from that of a fixed tilt angle case. Our model supports the idea that the GRBs with a plateau phase in afterglow may be originated from newborn millisecond magnetars.

Effect of Rapid Evolution of Magnetic Tilt Angle of a Newborn Magnetar on Light Curve of Gamma-ray Burst