%0 Journal Article %T Rapid Spin Deceleration of Magnetized Proto-Neutron Stars via Asymmetric Neutrino Emission %A T. Maruyama %A J. Hidaka %A T. Kajino %A N. Yasutake %A T. Kuroda %A M. K. Cheoun %A C. Y. Ryu %A Grant. J. Mathews %J Physics %D 2013 %I arXiv %R 10.1103/PhysRevC.89.035801 %X We calculate the spin deceleration of proto-neutron stars by asymmetric neutrino absorption in the context of a fully relativistic mean field theory. We calculate for the first time the spin deceleration of neutron stars due to asymmetric neutrino absorption in a toroidal magnetic field configurations. We find a surprising effect that the deceleration can much larger for asymmetric neutrino absorption in a toroidal magnetic field than the usually presumed braking due to magnetic dipole radiation. This may explain the observation that magnetars appear to have had a more rapid deceleration in the past. %U http://arxiv.org/abs/1301.7495v2